Polycom SoundStation 2W DECT 6.0 2200-07880-160 Wireless Conference Room full duplex telephone for 2-way natural conversation, DECT 6.0 technology for no wireless network interference, 64 bit voice encryption, 150ft wireless range, rechargable Li-Ion battery for up to 12 hour talk time / 80 hour standby time, portable charger with 3 hour charge time, cell phone dialing via headset cable connection for conference calls without a phone line in the room, backlit graphical display