BT Not afraid of losing items When the phone or other items cannot be found You can directly double-click the button to make a prompt tone When the item not know where it fel Open the mobile APP to view you know where it is dropped Automatic alarm Prevent Ioss When the phone is more than a certain distance from the object, the object Automatically sound the alarm to remind you to take back the lost items Compact in size, equivalent to a coin, it's easy to carry and can be conveniently placed in locations. Two-way search Easily retrieve items Double-click the round button of the anti-lost device. the phone automatically sound By clicking the alarm on the APP the item automatically sound Product parameter Product name: Smart object finder Product net weight: 21g BT version: BT 5.0 Product model: Y02 Use system: IOS/Android Standby time: 6 months Effective distance: 15 meters Battery model: CR2032 color:Black material: plastic Package Contents: 3 x smart object finders 1 x Instructions in Chinese and English 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.