Bluetooth Headset Battery is an application that is built to measure the battery life of a Bluetooth headset. 

The application can be used as a widget and an indicator on your phone's home screen. It works as an independent app and does not require any interaction with the device to function.

It is designed to be used with your Android device.

The widget can be configured to work with different Bluetooth devices. It works with any Bluetooth device that has a data connection. 

The widget has a status bar with a battery level that shows the battery percentage. It also shows the number of hours and minutes remaining.