Automatic programmer . Powered by 2 AA alkaline batteries 1.5 Volt. Easy to program, with 19 pre-set programs summarized in a diagram on the front bezel. It has a backlit LCD screen. The electronic parts are isolated and in the absence of exposed cables. Tap 3/4 "with pivoting ring. Pressure exerted from 0.1 to 12 bar. It 'can connect it to a rain sensor.