NEW DESIGN High noise cancelling performance Moulded Nexus Plug Detachable Microphone boom RCA phono and 3.5mm mono jack earpiece connector to suit most earpieces Small boom Microphone suits all kinds of closed and open face helmets with minimal intrusion into helmet lining New reversible side pod with RCA phono socket and 3.5 mm mono jack socket for easy installation and earpiece connection. Boom helmet kit for full face or open face helmets with 4 way Nexus connector (NO RED RING ON PLUG AND SOCKET). Suitable for most race car applications, this microphone is very efficient and relatively simple to install into most full face and some open face helmets using the supplied fitting instructions. The boom system is ideal to avoid wind noise problems associated with open cars. *** DSP3 Microphone upgrade only works with Autotel DSP3 noise cancelling systems and and later. fitted to systems supplied August 2018 onward. when plugged into an earlier system they will not work without upgrading the loom/radio system. Please contact our Tech support for advice on upgrades. USE WITH RR500 or RR550 EARPIECES (NOT SUPPLIED)