To Russian : I'm very sorry that this device can't be used normally because the local mobile phone system in Russia doesn't support this application(Find My Device App). Note: 1. Please use it with Find My Device APP. 2. Please confirm that your phone can download the Find My Device APP before placing an order. Thank you. 3. This tracker basically works like Air-Tags. It needs to update the location effectively when there are other android phones nearby.and the nearby android phone must also register or use Find My Device App to report the last tracker location to you. Smart tracker for Android: The Android version OTAG is a Certified location tracker that works with "Find My" app on Android phones (Android 9 or higher, NOT for iOS devices). Find Nearby: Use the Find My Device app to ring your Tag when it's within Bluetooth range.Click the 'Play Sound' Button, the device make a sound 'di di di'.Easily locate your lost items. Global tracking, fast location updates: Using 's global "Find My Device" service network, the location of the tracker can be tracked by other Android devices even if the tracker is out of Bluetooth range. In crowded areas, location updates take just 2-3 minutes. (Note: This feature is only available if there is an Android phone with the "Find My Device" app installed around the tracker.) Product Name: Item Finder Working Voltage: 2.6V~3.6V Working Temperature: -20~60 Battery: CR2032 Non Rechargeable Button Battery APP: Find My Device App Note: Please check as much as possible to make sure the item is what you need. Color: Black Material: ABS Package Contents: 2 x Finder 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.