Performance Teknique ICBM-932 Car A/B Switch Dual Channel IR headphones w/ Carry Case Channel A: 2.3 MHz and 2.8 MHz | Channel B: 3.3 MHz and 3.8 MHz Volume Control | Auto Off When No Receiving Signal On/Off, Channel A/B Switch | Cushion Swivel Ear Phones Adjustable Head Strap | Power On LED 2 x AAA Alkaline Battery