Working areas of anti-lost reminders is around 80 feet indoors and influence by bluetooth signal strength.The key finder is connected to the phone via Bluetooth and App. App have memory function for the last lost location (Not GPS).The key finder that makes music helps you find misplaced items quickly,Click the "CALL" on the App to make your key finder ring and find anything quickly. Lost your Phone?Double press the key tracker button,your phone would ring, even when it's on silent,The bluetooth tracker would alarm when disconnected or out of range, last about 40 seconds.Remind you to take away precious items.If you don't note the alarm,can help you find items quickly
