The 3M Peltor Comtac XPi headsets are designed to help reduce exposure to hazardous noise levels and enable two-way radio communication in noisy environments; detachable microphone; easy operation, "plug and play"; foldable for easy storage; external sound mute mode; equalizer mode; no external power needed, it is a complete standalone headset with fail-safe security. Specifications: - Power supply: 2 x AAA 1.2-1.5 V batteries - Operating time: ~ 200 h (depending on battery and temperature) - Weight: 335 g (with batteries) - Operating temperature: -40°C - +55°C (depending on battery) - Storage temperature: -50°C - +70°C