STEELMAN HD-6060N Replacement Headphones for STEELMAN Chassis EAR, Engine EAR, Engine EAR II Replacement Headphones for STEELMAN ChassisEAR (06600) and EngineEAR II (06800) Noise cancelling headphones eliminate background noise allowing user to hear only a vehicle's squeak, rattle, vibration and/or wind noise Extremely comfortable to wear Steelman headphones can be used with any device with a standard headphone jack