The 3M™ PELTOR™ DECT-Com II is a wireless duplex intercom system operating on the 1.8GHz DECT frequencies. It offers simple and efficient wireless duplex communication with up to 9 active users talking in full conference and additionally up to 40 listeners. There are two versions of the DECT-Com II main unit; base /portable units and portable units. The base/portable unit can be used as either a base or portable. It is a short range communication system with a maximum working range of approximately 300 metres outdoors.