Battery model: CR2032 (replaceable) Battery parameters: 240mAh Size approximately: 39 * 39.12 * 7MM Weight: approximately 9G (excluding lanyard) Color: White Accessories: 1PCS hanging rope Function: 1. Search for items 2. Find a phone 3. Location recording (breakpoint memory) 4. Reminder of forgotten items 5. Ringing tone/volume settings 6. Multiple device management (Apple phones can be bound with 16 anti loss devices, while Android phones can be bound with 18 anti loss devices) 7. Mobile phone can check battery level 8. Other settings (modify device name/image identification)