Features:_x000D_1.When your mobile phone exceeds a safe distance, the mobile phone will emit a sound reminder._x000D_2.When you forget to take your phone, the phone and the anti-lost device will make a sound at the same time optional._x000D_3.Call to find through the mobile APP, and the anti-lost device will have a sound reminder to help you locate your items._x000D_4.The mobile APP will display the location information on the map when the reminder is disconnected._x000D_5.Comes with a digital sticker, which can be combined into a contact number, giving you more possibilitise to retrieve the item._x000D_Notice:_x000D_Actual color may be slightly different from the image due to different monitor and light effect._x000D_Please allow 1-3cm deviation due to manual measurement._x000D_This product does not have remote positioning function, it cannot track moving targets, it only locates the last disconnected lost position.BT version: 4.0_x000D_Materials: ABS, steel_x000D_Product size: 92x35x10mm_x000D_Battery type: button battery included_x000D_Standby time: 4-6 months_x000D_Connection range: 12-15 meters_x000D_ColorStyle: As the picture shownPackage List:_x000D_1 x Smart Alarm Reminder_x000D_1 sheet of Number Sticker_x000D_1 x Manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin