Plantronics - CS520 Binaural Over-the-Head Wireless Headset 

Superior digital sound meets mobility and multitasking with these wireless headsets that let you answer important calls up to 300 feet away from your desk phone. Voice-dedicated DECT technology provides uncompromised audio quality, the lowest probability of interference and hours of talk time. Wideband audio support and noise-canceling microphone ensure your conversations sound clear. Lightweight design and a choice of wearing styles provide all day comfort and convenience.