The Bose Noise Cancelling 700 Triple Black Wireless Bluetooth Over-the-Ear Headphone is a used unit suitable for live monitoring. It has a 40mm driver size and double earpieces. The headphone has a UHF band and is wireless with Bluetooth connectivity. It has active noise cancellation, call functions, adjustable headband, playback controls, volume control, rechargeable battery, leather cushions, extra bass, built-in microphone, and touch control. The cable length is 0.8m and it has an impedance of 8 ohms.