VO357 Square Bluetooth Call Smart Watch | 1.83” Screen, 3ATM & OEM Wholesale Specs

1. Product Overview

The VO357 is an entry-level large-square fitness smart watch engineered for cost-sensitive global mass-market consumers, balancing a wide curved glass display and core communication & fitness functionality without premium advanced health sensors. Its core competitive advantages include a 1.83-inch ultra-narrow bezel screen with 2.5D curved glass, energy-efficient RTL8763EWE Bluetooth chip, independent local storage for contacts and call records, and a library of 100+ indoor & outdoor sport activity modes. This model omits blood pressure tracking, ECG, body temperature detection and female cycle modules to maintain an accessible price point, ideal for daily commuting, office use and casual light-to-moderate workouts for male and female users.

Target End Users

Budget-focused male and female daily consumers and casual fitness enthusiasts seeking a large-screen wearable with basic wrist calling and routine heart rate/SpO2 wellness logging, without high-end medical-grade monitoring features.

Target Wholesale Buyers

Private-label brands building high-volume budget smart watch inventory lines for mass consumer markets

Cross-border distributors specializing in cost-effective entry-level fitness and Bluetooth call wearables

Corporate procurement teams sourcing affordable universal bulk promotional gifts

VO494 Round Bluetooth Call Watch | VO478 Sports Fitness Watch

ISO 22810:2010 Waterproof Standard Reference

2. Core Hardware Specifications

2.1 Display Assembly

• Panel: 1.83-inch square full-touch HD screen
• Surface treatment: 2.5D curved glass cover with ultra-narrow bezel design
• Brightness: Adjustable backlight for indoor environments and moderate outdoor sunlight visibility
• Interface: Mass preloaded neutral sport and casual watch face templates; custom watch face graphic upload via paired mobile application

2.2 Watch Case & Water Resistance

• Housing: Slim scratch-resistant square alloy frame
• Dimension & Weight: 10.1mm thin chassis; 28g main unit (strap excluded)
• Waterproof standard: 3ATM (ISO 22810 industrial specification)
• Operational limits: Only blocks daily sweat, handwashing splashes and light rain. Not approved for swimming, diving, high-pressure water jets, hot baths, hot springs or sauna steam environments. Internal rubber sealing gaskets degrade naturally over prolonged water exposure and lose splash resistance over time.
• Strap waterproof note: The included soft silicone strap supports splash resistance; aftermarket metal mesh and leather straps provide zero water protection.

2.3 Strap System

• Standard accessory: One hypoallergenic soft silicone wrist strap per unit
• Stock options: Multiple neutral silicone color variants available for immediate bulk orders
• Structure: Quick-release lug design supporting third-party aftermarket strap replacement for brand styling customization

2.4 Power & Charging Hardware

• Cell type: Lithium polymer rechargeable battery
• Charging method: Magnetic pogo-pin docking charger; compatible input voltage 5V/1A
• Full charge cycle: Approximately 2 hours under standardized laboratory testing
• Runtime performance: Verified mixed-use runtime of roughly 7 consecutive days with daily Bluetooth calls, automatic heart rate tracking and regular sport mode activation
• Safety protection: Multi-layer charging circuits to prevent overcharging, over-discharging and minor internal short circuit risks

2.5 Wireless Connectivity Module

• Chipset: Low-power RTL8763EWE Bluetooth transceiver
• Calling functionality: Complete two-way wrist calling system with independent local on-watch storage for contacts and full call logs
• Notification functionality: Silent vibration alerts for incoming mobile calls, SMS text messages and mainstream social platform push notifications
• GPS note: No standalone onboard GPS chip. All workout movement trajectory data relies on GPS signals captured by the paired smartphone within the companion wellness app.

3. Cross-Device Compatibility

The VO357 maintains stable Bluetooth pairing and full feature operation on two primary mobile operating systems:

• Android 8.0 and all subsequent Android smartphone versions
• iOS 9.0 and all newer Apple iPhone devices Basic standalone watch functions (time display, local call records, heart rate tracking, step counting, alarms) operate without smartphone pairing; GPS route recording and full cloud data backup require a connected mobile device. All calling, tracking, sport recording and customization tools run fully through a unified multi-language wellness mobile application.

4. Sensor & Wellness Tracking Functions

Mandatory Non-Medical Disclaimer

All heart rate and SpO2 metrics generated by this watch are intended solely for consumer lifestyle and casual fitness reference. This device is not certified medical diagnostic equipment. No measured vital data may replace clinical testing instruments or professional physician evaluation. Users experiencing persistent cardiovascular discomfort or unstable blood oxygen levels must consult licensed medical providers promptly.

4.1 Standard PPG Optical Vital Sensor Suite

• 24-hour continuous automatic heart rate sampling with configurable abnormal heart rate vibration alert thresholds; single-tap manual spot measurement mode
• Real-time intermittent blood oxygen (SpO2) monitoring for resting and post-workout recovery status logging; all health and message alerts automatically muted during sleep cycles
• Verified lab baseline heart rate measurement accuracy exceeds 97%. Readings may deviate due to strap tightness, arm hair density, skin tattoos and fluctuating ambient temperature.

4.2 Multi-Stage Overnight Sleep Recording

Automatic full-night sleep cycle detection segmented into light sleep, deep sleep and REM sleep phases. Daily simplified sleep quality summaries store locally on the watch and synchronize to cloud storage within the mobile app after Bluetooth reconnection.

4.3 Unsupported Specialized Tracking Hardware

This budget mass-market fitness model excludes four dedicated advanced wellness modules to control retail pricing:

1. Long-term blood pressure trend recording sensors
2. Single-lead ECG waveform capture hardware
3. Continuous body temperature detection sensors
4. Female physiological cycle health tracking firmware and reminder logic

5. Comprehensive Multi-Sport Activity Recording

• Preconfigured 100+ indoor and outdoor activity profiles covering walking, jogging, cycling, yoga, basketball and various recreational ball sports
• Offline local storage for workout duration, real-time step count and total calorie burn; constant Bluetooth connection is not required during training sessions
• Automatic cloud synchronization of all offline fitness logs once stable smartphone pairing resumes indoors after workouts

6. Daily Lifestyle Utility Auxiliary Tools

All tools operable via touchscreen, calibrated for daily commute, office and casual fitness use:

• Bluetooth music playback remote control for leisure and post-training rest periods
• Remote smartphone camera shutter trigger for group and outdoor portrait photography
• Multiple customizable independent daily alarm clocks
• Sedentary standing activity reminders for extended desk working hours
• Regular hydration drinking alerts
• Stopwatch and countdown timer for interval training and daily schedule timing
• Real-time local weather data synced from paired mobile devices
• Find-phone one-tap locating function

7. Mobile App Cloud Ecosystem

• Bidirectional wireless data synchronization between watch terminal and multi-language wellness mobile app via Bluetooth
• Permanent secure cloud storage for all historical records: heart rate & SpO2 vital logs, full-night sleep archives and 100+ mode fitness activity statistics
• Auto-generated weekly and monthly simplified wellness trend dashboards for long-term cardiovascular and workout performance tracking
• Cloud backup mechanism prevents permanent loss of long-term personal health and training tracking archives

8. B2B OEM & ODM Wholesale Customization Program

Vositone holds 16+ years of wearable device research and mass manufacturing experience. Our standardized 10,000 m² factory operates dedicated assembly and testing production lines for large square IPS panels, RTL8763EWE Bluetooth chip stability testing, PPG sensor calibration and 3ATM waterproof sealing durability aging inspection. The internal professional team includes more than 70 full-time R&D engineers and over 300 production operation staff. We own more than 30 wearable technology invention patents covering low-power Bluetooth communication tuning, two-way call audio processing, PPG vital sensor algorithms and multi-sport activity calculation models. The factory controls maximum finished product defect rate at 0.12% after four sequential full aging QC inspection procedures, with stable monthly mass production capacity of 50,000+ units to support global budget fitness wearable bulk wholesale orders.

8.1 Tiered MOQ Customization Rules

1. 100 units: Custom laser engraving or silk-screen printing of buyer brand logo on the large square alloy watch middle frame
2. 300–500 units: Custom printed neutral sport retail gift boxes for small-volume white-label market trial orders
3. 1,000 units (Standard OEM Modifications)
   • Custom hypoallergenic silicone strap color matching and texture adjustment
   • Full retail packaging redesign with cost-effective casual fitness styling
   • System UI layout and exclusive custom boot animation development
   • Firmware fine-tuning: Bluetooth call audio volume, vibration alert intensity, abnormal heart rate threshold configuration and redundant function disabling
   • White-label rebranding of the companion wellness app UI
4. 3,000 units (In-Depth ODM Development)
   • Full 100+ indoor & outdoor sport activity algorithm recalibration aligned with global budget fitness consumer market demands
   • PPG heart rate & SpO2 sensor precision parameter optimization
   • Exclusive branded standalone multi-language wellness mobile app development with custom dedicated cloud data storage system
   • Custom branded user manuals and certification label customization
5. Flexible 0-MOQ drop-shipping support available for micro-batch brand test orders

8.2 Sample & Mass Production Lead Times

• Standard prototype sample development cycle: 10–15 working days
• Expedited rush sample service: Complete prototype delivery within 7 working days for urgent budget fitness brand and corporate bulk gift client projects
• All sample development fees can be fully deducted from subsequent formal bulk purchase orders after client deposit payment confirmation
• Standard OEM mass production cycle: 30–45 working days after factory receives and verifies client deposit transfer
• Full ODM integrated custom app & sensor algorithm calibration projects: 45–60 working days total turnaround cycle

8.3 Global Trade Compliance Certifications

The complete VO357 product line carries full globally recognized cross-border compliance certifications to support barrier-free customs clearance across all major international import regions: CE RED, FCC, RoHS, REACH, GCC, WEEE, ISO9001 Quality Management System

All non-compliant Bluetooth SIG BQB reference descriptive text has been fully removed to satisfy unified cross-border e-commerce platform content standard requirements. All wellness tracking features remain consumer fitness lifestyle-only functions; this budget square smart watch carries no official medical device regulatory certification.

9. Factory QC Testing & 12-Month Limited Global Hardware Warranty

9.1 Four-Stage Factory QC Inspection Workflow

Every finished VO357 unit completes full accelerated aging testing plus end-to-end full functional calibration before shipment dispatch. Mandatory standardized test checkpoints include:

• 3ATM sweat and splash waterproof sealing durability aging verification
• Low-power RTL8763EWE Bluetooth two-way call audio stability and local contact/call log storage testing
• PPG heart rate & SpO2 sensor accuracy calibration
• Full 100+ sport mode data calculation functional verification
• 1.83-inch square IPS screen brightness, 2.5D curved glass surface and touch responsiveness inspection
• Silicone strap durability and battery full-cycle aging performance testing

9.2 Warranty Coverage & Exclusion Terms

• Coverage scope: The 12-month global limited hardware warranty only covers confirmed original manufacturing defects on main watch electronic core, large square IPS display module and Bluetooth communication hardware.
• Items excluded from all warranty protection:
  1. Hypoallergenic silicone sport straps (classified as disposable consumable accessories)
  2. Naturally aging internal waterproof rubber sealing gaskets
  3. Surface scratches, paint fading, casing deformation and internal circuit damage caused by user impact, collision or improper deep/hot water exposure

10. NDA & Intellectual Property Transfer Terms

All full custom VO357 OEM/ODM development projects sign formal NDA non-disclosure agreements at the official project launch stage. Upon full settlement of order payment, buyers obtain complete exclusive intellectual property ownership of all custom development deliverables, including:

• Budget fitness large square alloy chassis structural engineering drawings
• Complete integrated firmware logic covering low-power RTL8763EWE Bluetooth two-way calling, local contact storage and basic PPG vital tracking
• Full parameter sets of heart rate & SpO2 PPG detection algorithms
• Fully customized branded wellness mobile app source code with custom cloud storage architecture tailored for mass budget wearable markets

Full IP transfer enables brands to build unique cost-effective large-screen fitness differentiated positioning within the global entry-level square Bluetooth calling smart watch wholesale market.

Compliance & Writing Standard Checklist

1. Logical flow strictly follows overseas B2B buyer evaluation path: Product positioning & target user groups → core hardware specifications → cross-device compatibility → sensor/wellness/multi-sport core functions → daily lifestyle utility tools → app cloud data ecosystem → B2B OEM/ODM customization program → factory QC inspection & warranty policy → NDA & intellectual property transfer clauses
2. All measurable technical parameters sorted by the comparison priority wholesale buyers use for vendor screening and product competitive evaluation (screen size, curved glass, Bluetooth chip, local call storage, sport count, cost positioning prioritized)
3. Clear independent segmentation of hardware specs, software functions, 3ATM water usage restrictions and optional paid OEM customization services; explicit note on non-waterproof aftermarket metal/leather straps
4. All vague, unsubstantiated promotional adjectives eliminated; only lab-verified objective technical data retained without empty marketing claims
5. Chinglish repetitive redundant phrasing fully removed; unified consistent professional industry terminology applied throughout the full document
6. Adopts IBM-style rigorous objective technical accuracy, paired with Microsoft-style short segmented paragraphs and readable bullet lists; sufficient transition words integrated to resolve Yoast low transition word proportion warnings
7. Independent prominent non-medical disclaimer and 3ATM waterproof usage limitation sections; clearly marked key hardware omissions: no blood pressure tracking, ECG, body temperature detection or female cycle modules; core selling points consistently highlighted: 1.83” 2.5D curved glass ultra-narrow bezel IPS screen, energy-saving RTL8763EWE Bluetooth chip, local on-watch contact & call log storage, 100+ built-in sport activity modes, cost-efficient mass-market positioning.

VOSITONE Smart Watch General Technical Specifications

Product Dimensions & Weight

All measurements derive from VOSITONE Lab testing data. To begin with, the watch boasts an ultra-slim profile, measuring precisely 10.1mm at its thinnest point (measured from phone surface to shell, excluding sensor area). Furthermore, its lightweight construction weighs merely 28g without the strap. However, it's important to note that final product weight may vary slightly. This variation occurs primarily because of different configurations. Additionally, manufacturing processes significantly affect final measurements. Moreover, different measurement methods may yield slightly different results.

Product Visual Representation

While product images and screen contents are shown for illustrative purposes, several important considerations apply. First and foremost, actual product appearance may differ in terms of color, size, and finish. Similarly, screen displays may vary regarding backgrounds, UI elements, and images. Most importantly, all watch face designs represent original artistic creations. Consequently, full copyright belongs exclusively to VOSITONE.

Health Monitoring Features

Heart Rate Accuracy

Lab tests demonstrate exceptional performance. Specifically, accuracy exceeds 97% at 10bpm. The testing covered numerous scenarios including, but not limited to, sedentary activities like sitting and reading, as well as various exercises such as treadmill use, running, walking, and cycling. Nevertheless, actual accuracy may vary due to several factors. Primarily, individual physiological differences play a role. Additionally, usage habits and patterns affect results. Finally, environmental conditions can influence measurements.

Blood Oxygen Monitoring

SpO2 measurements effectively track oxygen saturation levels. Essentially, this measures the percentage of oxygen-carrying hemoglobin in the blood. The system provides intermittent periodic readings rather than continuous monitoring. For optimal results, users should wear the watch snugly and properly. Moreover, keeping the arm steady during measurements improves accuracy. However, multiple factors can affect readings, including low blood perfusion, arm hair, tattoos, improper positioning, and cold temperatures.

Key operational notes include:

• Users must first enable automatic detection in the app
• When oxygen levels drop below the set threshold, the watch provides vibration alerts
• However, these alerts remain disabled during sleep periods

Medical Disclaimer

This product serves exclusively for health management purposes. Importantly, it is not classified as a medical device. All provided data serves merely for reference. Specifically, the information is not intended for medical diagnosis. Therefore, it should never serve as a basis for treatment decisions. For any medical concerns, users should always consult qualified healthcare professionals.

GPS Functionality(If Applicable)

The watch offers robust positioning features. In particular, it supports detailed GPS tracking through the companion app. Laboratory tests have thoroughly validated this performance. However, real-world performance depends on several factors. Environmental conditions represent a primary consideration. Similarly, individual usage habits affect results. Finally, signal interference can impact accuracy.

Water Resistance

The watch meets specific water protection standards. Specifically, it carries a 3ATM rating (30m per ISO 22810:2010). Accordingly, it's suitable for pool and shallow water activities. However, important restrictions apply. The device is not suitable for diving or snorkeling. Users should also avoid high-pressure water exposure. Furthermore, metal and leather straps lack waterproofing.

Critical notes regarding water resistance:

• Protection degrades gradually over time
• Therefore, users should consider alternative straps for swimming
• Additionally, regular inspection of seals is recommended

Charging & Battery Performance

Charging Requirements

Laboratory testing established these specifications at 25°C with 45-80% relative humidity. The device requires a minimum 5V/1A charger. Moreover, it performs best with original charging accessories. However, actual performance may vary due to several factors. Product differences represent one consideration. Similarly, usage patterns affect charging efficiency. Finally, environmental conditions play a role.

Battery Life Estimates

The typical usage scenario includes:

• 120 minutes of Bluetooth calls weekly
• 120 minutes of music playback weekly
• Continuous heart rate monitoring
• 90 minutes of GPS workouts weekly
• Daily notifications
• 200 screen activations daily

Notably, standalone GPS mode operates with separate runtime. Ultimately, actual battery life depends entirely on individual usage patterns and conditions.

System Requirements

The watch requires minimum supported versions:

• Android 8.0 or higher
• iOS 9.0 or higher
  Before purchasing, users should carefully verify their device's compatibility.

*Important Health Notice*

All health-related features serve specific purposes. They are designed exclusively for wellness tracking. While they provide valuable personal health insights, they are not intended for medical diagnosis. Consequently, they should never be used for treatment purposes. For any medical concerns, users must consult qualified healthcare professionals.

All specifications derive from VOSITONE Lab controlled testing. However, real-world performance may vary significantly based on usage conditions and individual factors.