The Savi 7310 is a wireless DECT headset which can be used anywhere sensitive conversations happen. Features: - Monaural - Up to 137 m line-of-sight range - Noise cancelling microphone with Poly Acoustic Fence technology - Conference up to four headsets with the wireless D400 dongle - Designed to fulfil DECT Security Step C standards -- The highest level of security as defined by the DECT Forum - Up to 13 hours talk time - Up to 52 hours standby time - Fully charged within 2 hours