3. Two-way alarm: set the Bluetooth disconnect alarm switch in the software to realize two-way anti-loss. When the bluetooth tracker and cell phone APP bluetooth is in the state of connection if the cell phone and loss prevention bluetooth is disconnected the cell phone and loss prevention will send out an alarm sound the items of cell phone is lost the alarm reminder. 5. Disconnect positioning: When the item is disconnected from the Bluetooth of the cell phone APP the APP will record the location of the item lost after disconnection and the location of the item lost after disconnection will be displayed in the map inside the APP. 2. Find cell phone function: when the device and cell phone APP bluetooth is in the connection state need to find the cell phone double-click the item locator button to call the cell phone the cell phone will make a ringing sound. 1. Compatible Devices: This item tracker works with smartphones with IOS 12.0+ and Android 10.0+. Finding function: Bind the anti-loss device with valuables when the device is in the state of connection with the Bluetooth of the cell phone APP use the APP's finding function to make the anti-loss device make a ringing sound so as to find the items. 4. Self-timer function: when the round bluetooth loss prevention device and cell phone APP bluetooth is in the state of connection use the self-timer function of the software to take pictures wirelessly.