Infrared (IR) wireless headphones. AAA battery power source . Power On/Off with auto Off . Volume control on headset for personal volume control. Automatic signal detection shut-off to improve battery life . Ear-cup provides universal fit, comfort and noise cancellation. Channel "A / B" selector switch (Works in both single and dual channel vehicles). Fully adjustable to fit both kids and adults . Fold for easy storage behind seats, in seat pockets, or under seats . Meets all automotive performance requirements (Automotive Grade) . No programming needed. Operation distance: >30meters. S/N ratio: 50dB. Frequency response: 30-20.000Hz. Transmitter powered by 2* R3 (AAA) batteries. Receiver powered by 2*R3 (AAA)batteries.