Poly Savi Wireless Headset System - Stereo - Wireless - Bluetooth/DECT 6.0 - 590 ft - 20 Hz - 20 kHz - Over-the-head - Binaural - Noise Cancelling Microphone - Noise Canceling - Black Headset system makes call management effortless with three-way connectivity to switch seamlessly between your PC, mobile device and desk phone. Enterprise-grade DECT audio allows you to roam or multi-task at far distances from your PC. For the most sensitive environments, you can turn up noise-canceling with the close conversation limiting feature for additional privacy. One-touch controls let you manage calls from any connected device within roaming range. Convenient voice prompts notify you of mute status, roaming range limit and more. And with up to 13 hours of talk time on a single charge, this headset is ready to work whenever you are. SoundGuard acoustic safety technology protects against acoustic shock by limiting sounds to below 118 dBA. Eight discreet security measures use the latest standards in wireless security to keep your conversations safe and secure.