Those long days at the track can do serious damages to your ears. Racing Radios has the solution. This ANR (Active Noise Reduction) Two-Way headset electronically cancels noise that would otherwise damage your hearing. It is powered by a 9-volt battery and will last approx. 18 hours on one battery. This headset is worn by the industries top crew chiefs, team owners and engineers. The ANR headset is perfect for all forms of racing and is compatible with any Motorola Two-Way radio with the appropriate headset cable. There is nothing like it.