Two-way search function, anti-loss reminder, remote photo taking function, GPS anti-loss tracker positioning function. Two-way search function: If you can't find the item, click the speaker button in the app to locate it by sound. If you can't find your phone, double-click the device button to sound an alarm. Anti-loss reminder: When the distance between the anti-loss device and the phone exceeds 15 meters, the device will sound an alarm in both directions to remind you to check the item. Tracking function: When the Bluetooth connection is lost, the tracking device app will record the location of both the phone and the lost device for tracking. This tracking device uses Bluetooth 4.0 technology, has ultra-low power consumption, uses a CR2032 button battery, and has a standby time of more than 10 months. Remote photo taking function: You can easily take selfies and group photos by remotely controlling the camera through the remote control app. Use the search function in the app to make the lost device beep to find the item. When the device is connected to a Bluetooth-compatible mobile app, double-click the device button to call the phone when you need to find it, and the phone will sound an alarm. If the device is connected to a Bluetooth-compatible mobile app, you can use the software's selfie function to take wireless photos. Double-click the device's power button to record video in the app. When the item loses connection to a Bluetooth-compatible mobile application, the application records the item's location after disconnection and displays the lost location on the device. (APP Map). Product Name: Anti-loss GPS Tracker Material: Acrylic/ABS Shape: Round Size: 42*42*8mm Battery: CR2032 Button Battery (Built-in) APP: Search Version Requirements: iOS 11.0 and above, Android 8.0 and above Quantity: 4 Notes: - Due to manual measurement, the size may have slight errors. - Due to different monitor settings, the color may be slightly different. "We not only provide you with high-quality products, but more importantly, we also provide long-term guarantees. By purchasing our products, you will receive comprehensive support, allowing you to shop worry-free." Satisfaction.