Features:1. BT Connection: Easy to find use BT 5.0 connection when the item does not know where to put it open the APP and click the alarm you can find the lost item according to the prompt.2. Two-way Anti-loss: Anti-loss device can find the phone and the phone can also find the anti-loss device.3. Easy One-click Search: When the phone is connected to the anti-lost device when the phone is connected to the anti-lost device I don't know where to put the phone just double click the anti-lost device button to find.4. Pet Finding Function: Help you prevent your pet from being lost no matter where you are you can easily find your pet according to the guide.5.After-sale service: If you have any questions please contact us immediately and we will help you solve it as soon as possible.Specifications:Application Range: 16mProduct Model: Y04BT Version: BT 5.0Standby Time: 6 monthsUse System: IOS/ AndroidBattery Model: CR2032Size: 37*37*8mmWeight: 7.77g includes: 1 *Anti-Lost Tag"