EARMARK's Valcomm900 series headsets can increase a group's speed, efficiency and safety. Engineered for simple operation with the company's audio circuitry, the VALCOMM 900 provides durable communications. Simplified controls make these radio headsets easy to use and simple to set up. With two sets of control options, Live Mic / Push To Talk (PTT) or Voice Activated Mic / Push To Talk (PTT) the mode switch allows users to select the best way to communicate. The fully articulating noise canceling electret boom microphone is easy to use and rugged enough to withstand intense use. Features include, 16 user selectable channels that are easy to change, stand alone or hard hat mount, Noise Reduction Ratio (NRR) of 26, range up to 150 yards (line of sight), water resistance and internal antenna.