When the device exceeds the Bluetooth distance from the phone,the device cannot. 1. " Find My " location be connected in the search App. Select : Lost Mode - Enabled. Enter your contact phone number, etc. If the device has been disconnected from your phone for more than a while, and there is another device near the device,you receive notifications and the latest location of the smart tag. 2. Play the sound: Mobile phone and device in the Bluetooth model domestic, (generally about 20 meters),in the " Find My" App, click, play the sound,the device issue a prompt sound, help you quickly find the near by smart tag. 3. Support wireless charging.Support the wireless charger power is 5W, or the wireless charger can be self-adaptively adjusted at 5W, 7.5W, 10W and 15W. Size:85.5 x 58 x 2.85mm Weight: 14.4g/0.49oz Battery: CX014545(rechargeable) Voltage: 3.7V Current: 170MAh Charging current: 130MA Time reguired tofully charge: About 80mins Wireless: BLE 5.2 Wireless transmisslon distance: 40m (Line-of-sight) Buzzer: Built-in 75db (in 10cm) Working Temperature: 5C to 45C(23F to 113F) Working humidity: 0%-95%(no condensation) Color: black Material: ABS Package Contents: 1 * Smart Card Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.