Convert a helmet headset to an over-the-head headset by attaching the main module of a 20S, 20S EVO, 30K or 50S to the earmuff cradle. Detachable microphone. Uses the same durable headband and earmuff bracket as the Cast. Uses the same microphone arrow design as the Cast. Uses HD speakers for audio. Noise Reduction Rating: Over-the-Head: 28 dB. Sound Level Conversion Rating: Over-the-Head: 33 dB. Signal-to-Noise Ratio: Over-the-Head: 34 dB.
