... 4 channels wireless transmitter Technical specification: Battery: 27A 12V Channel: 4CHWe can design/produce 1ch,2ch,3ch,4ch,5ch,6ch ... .VII:Waterproof:Under water 5~10metersVIII:Long distance wireless remote:100m,500m,1000m,2000m,10kmWe can design/produce 3 ... different functional wireless remote control systemindividually or design all the 3 functions together. ...