... 4 channels wireless transmitter Technical specification: Battery: 27A 12V Channel: 4CHWe can design/produce 1ch,2ch,3ch,4ch,5ch,6ch ... power:1000~5000wIII:Wide operating temperature range:-60~+500oCIV:Optional Frequency:303MHz,315MHz or 433MHzV:Coding way:Fix code or ... OFFpossition, when press button A on the transmitter, receiver channel A goes on 2 secondsthen goes off automaticaly...Same of ...