BT tracking helps prevent loss of items. When a phone or other item is misplaced, double-click the button to trigger a sound alert. If the item's location is unknown, open the mobile app to locate it. Features automatic alarm when the connected device moves beyond a certain distance, alerting you to prevent loss. Compact size, similar to a coin, making it easy to carry and place in various locations. Two-way search function: double-click the button on the device to make the phone ring, or use the app to make the device emit a sound. Product Name: Smart Object Finder Product Net Weight: 21g Bluetooth Version: BT 5.0 Product 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 User Manual (Chinese and English)