Silent Transmitters and wireless Headphones are simple and quick.
Here you can find the video instructions.
1: Connect the adapter to the socket
2: Select the transmission channel for your audio contents
3: Connect your device (mixer, pc, iphone, mac, ipad, etc) to the transmitter with the right cable (RCA, minijack).
Every transmitter has a button for channel selection, indicated by a lcd screen on the front. One single transmitter can cover one channel, and it is enough to send the signal to an infinite amount of headphones.