... is 4 channels wireless transmitter Technical specification: Battery: 27A 12V Channel: 4CHWe can design/produce 1ch,2ch,3ch,4ch,5ch,6ch ... is OFFpossition, when press button A on the transmitter, receiver channel A goes on 2 secondsthen goes off automaticaly...Same of ... channel B/C/D.Use field: Electric equipment ON/OFF wireless ...