W28 · Wrist-Worn Personal Safety Tracker
A 4G wrist-worn safety device for older adults, children and field staff, with five positioning methods, SOS, two-way VoLTE calling, geofencing and step counting
Discuss this modelKey features
- Lightweight for daily wear: a 50g PC+ABS body, silicone wristband and 1.85-inch touchscreen.
- GPS, BeiDou, Wi-Fi, LBS and AGPS positioning, with two-way 4G VoLTE calls and a separate SOS button.
- Step counting, shared access and FOTA updates; heart rate, blood oxygen, temperature, Bluetooth and offline payment are optional.
Functions in detail
Location and route history
- GPS/BeiDou outdoors, with Wi-Fi/cellular positioning as an indoor fallback.
- Current location, route history and geofence entry/exit alerts.
- AGPS assists satellite acquisition around buildings and residential areas.
SOS and two-way calling
- Hold SOS for 6 seconds to send a location alert and call designated contacts in sequence.
- Voice calls with an approved contact list and one-button hang-up.
- Low-battery reminders on the screen and in the connected system.
Activity and device management
- A three-axis sensor counts daily steps automatically.
- Optional heart rate, blood oxygen, temperature, Bluetooth, Super SIM and Alipay offline payment configurations.
- Shared access through the mini program and remote FOTA updates.
Technical specifications
| Parameter | Specification |
|---|---|
| Dimensions / weight | 57.4 mm × 42 mm × 16.5 mm; approx. 50g |
| Wristband / display | Silicone wristband; 1.85-inch TP colour touchscreen |
| Battery / charging | 700 mAh lithium-polymer; magnetic charging, approx. 2.5 hours |
| Cellular network | 4G multi-operator variant; Nano-SIM; VoLTE |
| Positioning | GPS + BeiDou + Wi-Fi + LBS + AGPS |
| Audio | Omnidirectional microphone and composite-diaphragm speaker |
| Buttons | Power button and separate red SOS button |
| Sensors / options | Three-axis step counting; optional Bluetooth, vital-sign monitoring, Super SIM and Alipay payment |
Installation and configuration
Check wearing fit, charging and the destination network/SIM. Confirm the app, contact list and alert workflow. Optional sensors, Super SIM and payment functions depend on the selected hardware, software and region; domestic multi-operator support does not imply worldwide coverage.