Full Duplex, 360 Degree Coverage Independent Echo Cancellation Mute Button Connects to System/Key phone, and mobile phone Connects to PC/Mac Availability: Usually ships the same business day. KT-50MSRP: $399.99Our Price: Choose a link from this drop down box Amplifiers -M12 Vista Telephone Headset Amplifier -CA10 Cordless Telephone -MX10 Headset Switcher Adapter -A20 Telephone Headset Amplifier -P10 Plug Prong Adapter -S10 Telephone Headset System -T10 Headset Telephone -T20 Headset Telephone Headsets-Home & Office -Mirage H41 H41N -Supra H51 H51N H61 H61N -TriStar H81 H81N -Encore H91 H91N H101 H101N -H131N Freehand -DuoSet H141 H141N Cordless Phones Mobile Adapters Mobile Headsets M114 M124 M145 Computer Headsets Analog Computer Headsets Digital Accessories - Parts Low Priced Specials Refurbished Product 2 Year Warranty All product shipped within 24 hours ($50.00 minmum) - FREE OF CHARGE The Headset Guy PO Box 131791 Carlsbad, CA 92013 Phone: (888) 793-8976 This Web site is run by a distributor of Plantronics® products and is not otherwise affiliated with Plantronics®, Inc.