For singers and musicians in a band or who otherwise perform live. This is an in-ear monitor system that comes with a transmitter that will pick up the signal from the sound board, and the receiver that you plug your headphones into and attach to your pants, and it turns your headphones into in-ear monitors where you can hear yourself and the music in your ears. This set is basically new. It was used for two performances and that's it. It's UHF wireless. It is a complete set with the carrying case, owenrs manual, and all the attachments (cables, power supply, headphones, antenna, extra earbuds). Only selling because I no longer need it. I did not ever use the headphones that came with it as I used others during performance. Product details are on the box as pictured. It will come with the box as well.