The SM-264D is Dual channels IR wireless transmitter works with any brand of universal infrared headphones. It is widely used in car DVD and home TV/CD/PC. Latest IR transmission technology with no interference from other RF wireless devices like FM radio,Wifi,works very well when watching streaming media (Netflix/ Prime/hulu). Easy to install. Simply plug the transmitter into the Optical /RCA /Headphone port of the car DVD player/TV/PC/ipad etc. and these devices will be turned into a wireless infrared system. Turn on your IR headsets, it will auto connect to the transmitter so users can listen to the movie/music quietly and wirelessly. Place the transmitter on a high place without any obstacles in front of it. Transmitter can be powered by 12v cigarette lighter outlet or ac adapter. For vehicle IR system, it can leave a peaceful space for the drivers while passengers can use their IR headphones to listen their favourite movie/music quietly. One transmitters supports several IR headphones working simultaneously. To watch two different movies in the same row, you need to connect two transmitters to two DVDs respectively, one of which uses channel A and the other uses channel B. For home IR system, you can listen to your favorite late night TV show while your partner sleeps peacefully by your side. Or kids can use it to work with their IR headphones to watch cartoons. You don't need to put up with a huge brainstorm caused by the noise of children watching cartoons any more. Features: 1. Suitable for any audio system, like car DVD, TV, CD, PC etc; 2. Operating distance up to 30 feet; 3. One transmitter supports several IR headphones to be used simultaneously 4. Double PLL system for ultimate frequency stability; 5. No need manual pairing, no audio delay, no radio or wifi or microwaves interference; 6. Enter standby mode automatically after no signal is received for about 5 mins.

?Compatible with any brand of universal IR wireless headphones? - IR frequencies: Channel A: L: 2.3MHz, R: 2.8MHz; Channel B: L: 3.2MHz, R: 3.8MH. Effective range up to 30 feet (without obstacles in front of it). Include home AC adapter and car cigarette lighter as well as Optical, RCA & 3.5mm audio cable, very convenient to use at vehicle as well as home. ?Perfect Reproduction of Sound Details, Connecting Two Transmitters to Two DVDs Allows Simultaneous Watching of Different Movies? - One wireless transmitter supports several infrared headphones working on the same channel at the same time. To watch two different movies in the same row, you need to connect two transmitters to two DVDs respectively, one of which uses channel A and the other uses channel B. ?Dual channels wireless IR transmitter with Optical in? - Can be hooked up to the Digital Optical or Analog Audio Output of your smart TV/cable box/STB/Direct TV box etc. If you want to connect to smart TV with optical cable, ensure your TV or TV related cable box/STB’s audio format is compatible with “PCM” or can be set to “PCM”. ?Easy to Set Up, No Need Pair, No Audio Delay, No FM or WIFI Interference? - Very suitable for working with IR headsets to watch streaming media like Netflix, Prime etc. IMPORTANT: Please set the volume of your audio source (e.g., car DVD/PC/TV & TV related cable box etc) to a sufficient level to ensure steady audio signals, or headphone sound will be cut out consistently. ?Make Your car IR Headphones Reusable After a Car Trip? - Don’t relegate your IR headphones to the closet any more. With this transmitter, you can enjoy late night TV shows without worrying about disturbing your family or kids can leave you a peaceful space by using it to watch their favourite cartoons or play games. It is widely used for car DVD players without IR function as well as home TV/CD/PC etc. And we suggest to use Simolio IR headphones for better performance.