1.Wireless portable headset for compact storage.Widely used for silent party, meeting, education, broadcasting, tourism,yoga and so on 2.Compatible with transmitters that have a range of up to 150 meters making them great for large events. 3.Phase-lock loop technology prevents signal loss over longer distances or in unusual environments; Advanced 40mm speakers provide a well-balanced, high definition sound. 4.Playing up to 3 different audio streams,allow your guests to choose which tunes they love the most;Automatically mute after 5 minutes of not receiving any broadcasted audio 5.Several headphones can work with 1 transmitter simutaneouly;Big-size luxurious and superior comfortable ear pads, isolating against noise with a tight seal that improves sound quality.syi