The Donkey powers up as soon as it is plugged in, so all you need to do is flick a switch to assign a channel you want to transmit on and you're all set! You need one Donkey for every music channel you'd like!
Harry 3 Channel Silent Disco Headphones
LEP Multicassa 3-Channel Analogue Drum Machine With Clock Divider Sequencer
Portable 40W Battery Powered Acoustic Guitar Amplifier with Bluetooth – Coolmusic BP40 – 3-Channel PA Speaker for Guitar, Mic & Keyboard – Rechargeable Outdoor Performance Amp
KSR Ceres 3-Channel High-Gain Preamp Pedal
AC Euro AC 100 100W Solid State Guitar Amp Head 3-Channel 4 Ohm
12v DC Power Supply for Donkey For Silent Disco Transmitters