Important Note: * It is IR headphone,not bluetooth headset,don't support bluetooth. * AYVVPII IR headphones are compatible with most car DVD systems. For a quick confirmation, please double check your DVD system (the manual) that come with your car or consult car manufacturer. * Our headphones work with universal IR frequencies: Channel A: L/2.3MHZ,R/2.8MHZ; Channel B: L/3.2MHZ,R/3.8MHZ).Just make sure your DVD Player is the same frequencies. How to Performance: 1.Please use 2×AAA batteries and make sure they are inserted properly 2. Switch headphone to the A channel with red indicator light( if you switch to the B channel,it is green light). 3. Turn on your music player or movie on your car DVD system and then enjoy music or movie 4. If your headrest DVDs play together,please make sure one at A channel, the other at B channel to avoid interference with each other. 5. We supply 3.5mm Jack Cable together with package, you can use it to connect our headphone to your phone,MP3 player or any device that uses a standard 3.5mm cord and use it as a standard pair of headphones. 6.No batteries required when plugged into a device with our 3.5mm Jack audio cable. 7.Our headphones well work with universal Vehicle Entertainment Systems allowing backseat passengers to enjoy excellent sound clarity from movies, videos and music without disturbing other passengers and drivers. Fodable Fit for Compact Storage * IR headphones fold neatly for easy carry. * The fancy non-woven bag allows safe storage and compact on- the-go travel when not in use. Soft Earpad for Comfortable Use Soft earpad and adjustable headband fits all head sizes and ensures a a comfortable fit for hours of enjoyment without pressure. Auto Shut-Off to Save Power Headphones will automatically shut off after approximately 10 minutes when no audio signal in to ensure maximum battery life. 3.5mm Audio Port and Cable 3.5 mm audio cable allows working with smart phones, Kindle fire, tablets , MP3 player and even airplane entertainment systems as a standard pair of headphones without battery. Pay Attention to the IR Transmitting Angle and Distance The best audio signal will be obtained if you sit directly in front of the monitor within 10 methers. If you sit on either side of the monitor you can expect the same great reception within 35 degrees to the left or the right of the monitor. Specification * System:infrared light (850nm) * Carrier frequency: a) A channel: Left channel :2.3Mhz Right channel: 2.8Mhz b)B channel: Left channel : 3.2Mhz Right channel: 3.8Mhz * Mode: FM stereo * Power supply of headphone: 2xAAA batteries (you need to ready it ) * Operating distance:10 meters Standard Packing List 2 x IR Headphones 2 x 3.5mm Audio cables 2 x Non-woven bags 1 x User Manual Please double check if your car headrest/Roof DVDs can work with the IR headphones or not before purchasing,Thank you:)