Sennheiser 231 Mono Bluetooth Headset- The ultra-secure bluetooth wireless headset is the perfect choice for financial, medical, government and contact centers or anywhere sensitive conversations happen
Amazon.com: Sennheiser SC 135 USB (508316) - Single-Sided (Monaural) Headset for Business Professionals | with HD Stereo Sound, Noise-Canceling Microphone, & USB Connector (Black), Adjustable : Electronics