HT - Factory Reset
To perform a factory reset on the BTH220, first make sure that the headset is powered off. Once the headset is off, hold down the Power button, the Volume - button, and the Volume + button at the same time until the blue LED blinks twice, slowly (about ten seconds).
Once the headset has been reset, it will need to be re-paired before use. Before pairing, make sure that all old pairing information has been deleted from the device that needs to connect to the BTH220.