1. When the device is connected to the cell phone APP Bluetooth, use the search function of the APP to make the anti-loss device sound and find the item. 2. Applicable objects: elderly, children, keys, wallets, luggage, etc 3. Material: ABS 4. Compatible system: suitable for Android 5. Standby time: about 1 year 6. Note: the color of the protective case will be shipped randomly
