Global Positioning Systems (GPS)
Elderly GPS Tracking Device, 4G Personal Locator by Brand, SOS Emergency Button, High-def Call, Precise Global Positioning, Waterproof, for Elderly, Alzheimer
One-key help is convenient and quick: preset 3 help calls, press and hold the SOS button of the locator for 5 seconds, the locator immediately sends an alarm signal and dials 3 help calls. High-definition call: high-definition two-way voice call,...
https://www.bizrate.co.uk/globalpositioningsystemsgps/elderly-gps-tracking-device-4g-oid24966831624.html