Single Wireless Infrared Stereo Headphone - 8 Meter Effective Range 45 degree Left Right.Light Weight Adjustable Size Comfortable Headset - Operates Up To 48 Hours On (2) AAA Batteries (Not Included).Power On/Off With Auto Shutdown Feature.Volume Adjust Knob.Carrier Frequency: Right Channel 2.8MHz, Left Channel 2.3 MHz This pair of Pyle View wireless IR headphones is great when you need peace and quiet in the car. They work seamlessly with our in-car DVD players and monitors that are equipped with wireless-headphone IR technology. These headphones are lightweight, durable, and have padded earpieces for long-term, comfortable listening. They’re also adjustable to accommodate any size head – child or adult. The volume, power, and stereo/mono controls are conveniently located on the headphone. The headset requires 2 AAA batteries for 48 hours of battery life. With Pyle View headphones, you’ll enjoy your favorites peacefully.