LED-equipped & ultra-lightweight coin-sized Bluetooth® tracker "TrackR pixel" Key features are as follows: ・Alerts you and warns you about leaving items behind when you get a certain distance away (up to about 30m). ・You can operate the app to make the TrackR Pixel ring and immediately locate it. ・Cloud locate allows you to track lost items. ・Equipped with an LED light, so you can find it easily even in dark places. The CR2016 battery is discharged. Please purchase a new one.