ZeroNoise Pit-Link microphone helmet kits. These ZeroNoise kits are designed to suit full face helmets, enabling the fitting of a noise cancelling microphone mounth piece, which connects to your circuit helmet, for use with RCA or stereo earplug headset. The helmet kits connect to the amplifier via an either a 4 or 5 pin male Nexus plug. The 4 pin version is correct for use with the ZeroNoise Pit-Link GSM communication system
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