We’ve found a nice audio and hands-free Bluetooth headset using the “bone conduction” technology. As you have probably guessed, the HG40SAN-TBT doesn’t have earpieces, but you can still hear music and conversations with the vibrations emitted by the headset thru your skull. The headset has a battery that lasts 3 hours in conversation mode and 5 hours in play mode (MP3). It supports HSP, HFP and A2DP, weights 50g and measures 130×80x133.