The HP Poly CS540 over-ear true wireless headset delivers the freedom to move and stay connected. This DECT headset provides secure, interference-free calls with up to 350ft. of wireless range. Enjoy rich audio from deep lows to clear highs, thanks to its wide frequency range. The noise-cancelling mic blocks background noise for clear, easy conversations. | HP Poly CS540 Over-Ear Noise Cancelling True Wireless Headset - Black