Brand: PLANTRONICS
The H251N-CD is a monaural, ear muff headset, Noise Canceling microphone, 4 pin Quick Disconnect. These lightweight headsets feature narrow-band receiver audio and are optimized for use in mission-critical applications such as air traffic control and emergency dispatch. They are terminated with Plantronics H-Type 4-pin QD (Quick Disconnect) and are compatible with the audio processors.