The Discover Adapt 30 wireless office headset system is built for professionals, and is 100% compatible with the leading desk phone brands like Avaya, Polycom, Mitel, Shoretel, Nortel, AT&T, Panasonic, Yealink and more. Don't be stuck with mono or duo wearing options, have them both. This is the only headset that will allow you to convert from a single to dual speaker. As the noise gets louder in your office, simply snap on the dual speaker headband and you'll be able to concentrate. In addition, the Discover Adapt 30 connects with 98% of corded desk phones on the market. Instead of purchasing new headsets should your phone system change to a PC or mobile based application, simply add an inexpensive cartridge, rather than having to purchase new headsets. Also, you'll have up to 350 feet of wireless range and 9 hours of battery talk time to keep your conversations going, without a cord to get in the way! Lastly, for peace of mind you're covered with a 3 year advanced replacement warranty ensuring you're protected.