Plantronics CS55 Wireless Office Headset 1.9GHz new voice-dedicated frequency eliminating interference from nereby Wi-Fi networks and other wireless office equipment #69700-06 - NEW. This headset provides brilliant voice quality, noice-canceling technology features ideal for busy office environments. Add the optional HL10 to answer and end calls with the touch of a button. Roaming distance is 300ft, 64 bit encryption, 10 hours of hands-free talk time and 50 hours of standby time.