BT tracking, not afraid of losing items. When the phone or other items cannot be found, double-click the button to trigger a prompt tone. If the item's location is unknown, open the mobile app to view its last known location. Automatic alarm helps prevent loss: when the phone moves beyond a certain distance from the item, the device will sound an alarm to remind you. Compact size, similar to a coin, easy to carry and place in various locations. Two-way search function allows easy retrieval of items. Double-click the round button on the anti-lost device to make the phone ring. Use the app to trigger the item’s alarm sound. Product parameters: Product name: Smart Object Finder Net weight: 21g Bluetooth version: 5.0 Model: Y02 Compatible systems: iOS/Android Standby time: 6 months Effective range: 15 meters Battery type: CR2032 Color: Black Material: Plastic Package contents: 3 x Smart Object Finders 1 x Instruction Manual (English and Chinese)