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The SM-261A is single channel IR wireless transmitter works with any brand of universal infrared headphones. It is widely used in vehicle audio system 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/Amazon Prime/hulu).Easy to install. Simply plug the transmitter into the RCA or Headphone jack 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. Ensure to place the transmitter on a high place without any obstacles in front of it, so that the headphones can pick up the sound smoothly. 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. Or parents can listen the FM radio while kids can use their IR headphones to enjoy their favourite cartoons.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. One transmitters supports several IR headphones working simultaneously. You don’t need to put up with a huge brainstorm caused by the noise of children watching cartoons any more. Features:1.Â Suitable for any audio system with RCA or 3.5mm jack, like car DVD, TV, CD, PC etc2. Operating distance up to 30 feet3. One transmitter supports several IR headphones to be used simultaneously4. Double PLL system for ultimate frequency stability5. No need manual pairing, no audio delay, no radio or wifi or microwaves interference6. Enter standby mode automatically after no signal is received for about 5 mins.