SupraPlus Wireless Professional Headset System with Noise Cancelling. Built on digitally-encrypted DECT 6.0 technology, the Plantronics SupraPlus Wireless Professional Headset System combines the clarity of traditional corded technology with the mobility of wireless, so conversations can continue up to 300 feet from a desk phone. Extended hands-free talk time up to 10 full hours. Noise Canceling microphone.