1.9 GHz Cordless Headset DECT 6.0 Technology Over the Ear Headset Range of Up To 350 Feet Wireless Noise-Canceling Microphone (Reduces Background Noise) One-Touch Controls Volume / Mute / Call Answer / End Clear, Private, & Secure Conversations Conferencing Up To 4 Headsets Conference In Upto Three Additional CS500 Or Savi Headsets 64-Bit Digital Encryption 0.75oz Headset Weight Charge Indicator Light Up To 7 Hours Talk Time 3 Hour Recharge Time 80% Power w/ 1.5 Hour Recharge CAT-iq Technology Discreet, Stylized Design Lightweight and Comfortable All Day Optimized for Performance w/ IP Desk Phones Recommended for All Environments, Even Those w/ Loud Noise Levels Use W/ Electronic Hookswitch Cable Or Handset Lifter To Remotely Answer/End Calls