Keep tracking and find your items in the Find My App(only ); Built-in speaker play beep sound to help find your things, when you item lost,it can leads you right to your nearby or tell you the est location. Don't need to download any app, just click play sound in for Find My, and the key tracker tag emit a sound to guide you quickly to find the stuff. Wide Range of Applications Suitable for wallet, backpack, suitcase, cars and any other business you want to know the location in time. Privacy Protection & Easy operate: To protect privacy, all communication with the Find My network is anonymous and encrypted, Location data and history are never stored on the finder tag.The tag has been certifed MFI, only open Find My APP and bluetooth, then tap "Add Item" and "Other Supported Item" Unlike other Android smart finder, our Bluetooth key finder have a more powerful range and accurate positioning through Find My network & bluetooth. You don't have to get close to the items. You can use the key tracker or anywhere. Use the Find My APP to ring the tag when it's within Bluetooth range. if it out of Bluetooth range, In Find My app ,it direct you find your item position. Battery:CR2032-230mAh Communication protocol:Bluetooth 5.2 Colour:A:Black Material:pc Package Contents: 1 * Locator 1 * English 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.