RTS HR-1 A4M Single-Sided Headset with Flexible Dynamic Boom MicA4M connector for RTS and Telex systems. The HR 1 is a single sided, medium weight passive noise reduction headset with dynamic noise canceling microphones. The headset has a noise reduction rating of 21dB; suitable for use in a moderately noisy environment. The ergonomic moleskin covered headband design distributes the ear cushion pressure evenly over the entire ear with no pressure points, ensuring hours of comfortable wear. An added advantage of