If you can't find your keys or wallet, open the mobile app, click the "Alarm" button, and the item will beep. If you lose your phone, double-click the button of the anti-loss device, and your phone will sound a ton. You can find your phone quickly. It effectively protects your children, pets, or valuables from being lost within an effective distance of 15m/49.2ft. When beyond this range the phone and this device will automatically ring to alert you in time and locate. The smart Bluetooth finder is suitable for purses, cars, kids, pets, bags, suitcases, or other valuables. Bluetooth 5.0 Technology: The anti-loss device uses the latest Bluetooth 5.0 low-power technology. By using APP software and connecting with mobile devices such as cell phones via Bluetooth, users can easily bundle their valuables together to achieve the function of item loss reminder and item location. Portable: It is lightweight and compact, easy to pick up, and effortless. Weighing just 0.07 kg/2.47 Oz, it's easy to carry wherever you go. Thanks to the built-in low-power Bluetooth compatibility, the battery lasts up to 6 months.