... This is 1 channel wireless transmitter Technical specification: Battery: 27A 12V Channel: 1CHWe can design/produce 1ch,2ch,3ch,4ch ... wireless remote:100m,500m,1000m,2000m,10kmWe can design/produce 3 different functional wireless remote control systemindividually or ... Jumper is OFFpossition, when press button A on the transmitter, receiver channel A goes on 2 secondsthen goes off automaticaly...Same ...