This system has 2x speakers, background noise cancelling microphone and all connected to outgoing Nexus female socket.
Adapted for open face/jet helmets without integrated chin bar.

Most common use in disciplines where communication is happening mostly between races or during the race in the car where hearing the outside engine noise is mandatory due to fact that speakers do not have earmuffs. Thus most of the engine and outside noises are still heard.

Outgoing socket: Nexus female.
Compatible with nexus connectors (see picture ) for radio communication systems or Rally amplifiers with nexus type connectors.
Shaft diameter: 7.1 mm 

WARNING: This item are not compatible with Trophy type sockets/connectors (6.35 mm). See picture .