The Bluetooth disconnection will trigger an alert, and the app will record the location when the connection is lost. Open the app and activate the alarm to locate the item by the sound emitted from the anti-lost device. Two-way search function: double-click the button on the anti-lost device to make the phone ring. Bluetooth 5.2 connection with an effective range of up to 15 meters; distance may vary depending on environmental conditions. Alarm reminder feature helps prevent loss and makes finding items easier. Product name: Anti-lost device Bluetooth version: Bluetooth 5.2 Compatible systems: iOS/Android Effective distance: 15 meters Battery type: CR2032 Product dimensions: 37 x 37 x 8mm Material: ABS Color options: Green, Blue, Black, Pink, White Package contents: 1 x Locator Note: The package includes only the items listed above. Light reflection and display differences may cause slight variations between the image and the actual product color. Measurement error allowance is +/- 1-3 cm.