The MB 660 is the newest Bluetooth headset from Sennheiser! We have it in a standard UC version (DISCONTINUED!) and a UC version optimized for Microsoft Lync. Customers with Skype for Business will need to get the MB 660 that is certified for Skype for Business. This headset is super-fancy! Here’s how to work it : TO TURN ON/OFF: Turn the earphones inward (so the headset is no longer flat) to turn it ON. It will say “Power On” in your ear. Turn the earphones outward (so the headset is flat and can go back in its case) to turn if OFF. It will say “Power Off.”. PAIRING: Pairing this headset is usually automatic. The headset will say “Pairing” and you will see the run lights on the headset going when its in pairing mode. If the headset doesn’t automatically say “Pairing” and show you the run lights on the side, you’ll need to manually pair it. To do this, press the Effect Mode Control button (bottom button on the right side) and hold it for 4 seconds to manually put it into pairing mode.…