A Smart Bluetooth Anti-Lost Device is a small electronic tracker designed to help users locate personal belongings such as keys, wallets, bags, laptops, TV remote, pets, or even bicycles by using Bluetooth connectivity and a mobile application.
 
How It Works
The tag/device is attached to an item you want to track.
The device connects to your smartphone via Bluetooth (typically BLE 4.0+).
When the item goes out of the Bluetooth range (usually 10–30 meters), the phone triggers:
Alarm notification
Vibration
Map location history
You can also press a button in the mobile app to:
Ring the device to find your lost item.
Some devices allow reverse search:
Press a button on the device to ring your phone, even if it is in silent mode.