Find items: Press the call button on the mobile phone APP, and the anti-lost device will make a sound Reverse search for the phone: Press the anti-lost device button twice in a row, and the phone will make a sound Anti-lost disconnection alarm: The phone will make a sound reminder Location record: The last disconnected location record Notice: 1. This product is not a WIFI product, but a Bluetooth product. The mobile phone's Bluetooth must be turned on when using it. 2. Compatibility: only applicable to IOS system. (Each mobile phone has built-in search software, no need to download any software. Working current:3.7mA Standby power:consumption 15uA Volume:50-80dB (adjustable) Battery:CR2032 Colour:B:Green Material:Plastic Package Contents: 1 * Anti-lost device 1 * Lanyard 1 * Pry opener 1 * Multi-language instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.