The ZeroNoise Pit-Link Kart Trainer/Communication System has been designed and constructed to be the perfect communication tool for karting. A noise cancelling micro amplifier that connects to your smartphone via Bluetooth and enables you to communicate to other people (back in the pits). Fixed onto your suit with a Velcro patch or to the side of your helmet, or alternatively can be worn around your neck and kept inside your suit.Super fast Bluetooth connectionProvides reliable pit to kart communication without radiosIncludes micro amplifier, helmet microphone kit, earplug kit and optional pro headsetIndependent volume controlDynamic noise cancelling microphone with spacers to set the correct distance from the mouth for optimum performanceLong life rechargeable internal batteryThe micro amplifier connects to the included ZeroNoise Pit-Link Trainer Microphone Kit via a USB C connector. Communication is automatically on when the phone call is coming through so there is no need to press a