IR Wireless Headphones: The Audiovox MTG-HP2CA wireless headphones operate off of a carrier frequency of 2.8mHz or 3.8mHz for the right channel and 2.3mHz or 3.2mHz for the left channel. The wireless headphones requires two "AAA" alkaline batteries, which are included. The lightweight headphones offer an adjustable fit with comfortable faux-leather ear-pads and vinyl headrest. The battery compartment is on the left earpiece, while the On/Off button is located on the right earpiece. The right earpiece also has a rotary volume thumbwheel control, and a red LED which illuminates when power is on. The headphones Auto Power Off feature turns the headphone's power automatically off after a few minutes without receiving a signal source. The headphones offer a frequency response of 30-20kHz. The headphones ear-pieces rotate and fold-flat for easy storage.