About this item: 
Dect 6.0 technology: place the Wireless microphones anywhere in a conference room and enjoy interference-free, high-quality sound. 
Premium sound quality: thanks to features like full-duplex technology, digital mixing and audio equalization, nothing is lost in translation.50 name/number phone book entries 
Full room coverage: six microphones - four Wireless and two fixed - maximize room coverage and participation. Number saving from CID log to phonebook or speed dial 
With up to 8 hours of talk time and 70 hours of standby time on each Wireless microphone, there's plenty of room for meetings that run over. 
Charging built-in: magnetic Charging bays in the base Phone ensure the Wireless microphones are always charged and ready.