Plantronics CS540 Monaural Convertible Wireless HeadsetSuperior 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. Headset Type: Monaural; Headset Style: Convertible; Earpiece Type: Earhook/Ear Cushion; Talk Time: 10 h.