Superb voice conferencing performance with the freedom and flexibility of wireless Polycom Acoustic Clarity™ technology delivers clear, natural conversations DECT 6.0 technology for no wireless LAN interference Roam up to 150 feet from base station Up to 24 hours of talk time 10-foot (3.5-meter) microphone pickup range Added security of voice encryption Features and Benefits Phone contains a rechargeable Lithium-Ion battery for wireless roaming up to 150-feet from the base station. Ideal for moving conference calls between offices and conference rooms, or just eliminating conference table clutter Patented Polycom Acoustic Clarity™ technology delivers remarkable voice quality and natural, free flowing conversations to make your audio conferencing more productive and enjoyable Up to 10-feet (3.5-meter) of 360-degree microphone coverage, ideal for small to midsize conference rooms. EX model can add optional expansion microphones for even greater pickup range Resists interference from mobile phones and other wireless devices while delivering clear audio conferencing with no distractions Applications Port connects to mobile phones for dialing from rooms without an analog phone line, and connects to a PC to become a high-quality conference phone for Internet calling Software upgradeable for investment protection and adding future audio conferencing features