(2) Rockville RFH3 Wireless Infrared IR Car Headphones for Any Car Monitor Rockville RFH-3 Dual Channel IR Headphones Foldable design for Travel convenience and easy storage, Comfort control leatherette ear surround Dual channel function capable (A/B). Improved acoustic performance, 40mm Mylar dome speaker built in. Extended bass response Impedance: 32 Ohms 10%. Effective distance: 10 meters (max.), Light weight design for wearing comfort Auto muting on headphone. Auto power off when no signal