TrueBlue TB-100T3 Over the Head Noise Reduction Bluetooth Headset Sleek design with comfort plus head cushion and 180 degree swivel ear piece for ultimate fit Turn-To-Talk Technology (TTT) - turn down mic to answer call. End by returning the mic to stand-by position (patent pending) 320 degree swivel microphone for left or right ear usage. Bluetooth version: CSR v2.0+EDR Class II with DSP Talk time: Up to 13 hours