This anti-lost device is a product based on for Bluetooth 5.0 low power consumption. Through the mobile phone APP software, the user's easy-to-lost items (such as keys, handbags, etc.) are bundled together to realize the anti-lost of items Two-way anti-lost reminder when the mobile phone and the item are beyond a certain distance, the item will send out a for Bluetooth alarm reminder, not afraid of the item being lost APP breakpoint location, easy to retrieve, when the item does not know where it fell, open the mobile phone APP, you can find it according to the map Lightweight, compact and portable, easy to pick up Specifications: Product model: Y02 Bluetooth version: Bluetooth 5.0 Support system: iOS or Android Effective distance: 15 meters Product size: 38x38x 7mm Net weight: 7g Standby time: 6 months Battery type: CR2032 button battery(built-in)