With "Test bluetooth Ring & Battery" you can do a quick test of the headset call signal and know the headset battery level. Use "Test bluetooth Ring & Battery" to check if the Bluetooth headset is working properly. The program shows the data received from the Bluetooth audio device. Not all bluetooth devices currently support the HeadSet Battery Protocol. Depending on the Bluetooth class of the audio device, the accuracy of the charge data is different: - high class (transmits 10 battery state