The ZeroNoise Pit-Link bluetooth amplifier is a professional digital amplifier which provides both communication between driver and co-driver and also communication with the pit / service crew at the same time via bluetooth connectivity to a smart phone. Communication can either open up automatically or via a push to talk (PTT) button if preferred (PTT button sold separately).Driver to Co-driver communicationCar to pit / service crew via bluetooth smart phone connectionDigital noise filters and voice equalisation provide excellent communication clarity even in the most demanding conditions2m long helmet / headset connection cablesEasy to use Multi-function touch screen displayRCA output for camera audioThe ZeroNoise Pit-Link bluetooth amplifier is available with various headset connection options so it is compatible with Bell and OMP intercom helmets, ZeroNoise headsets and also other brands which use Nexus type plugs such as Stilo, Sparco and Peltor.