Transformer 120v/60Hz to 12 volt AC 60Hz used with many Autotrol valves in the U.S.A. ( North America Plug ).PN 1000811 and PN 3019151 and newest PN 44149The power cord is 10 feet long.Please NOTE: The older versions were only rated for 150 ma, and the newer versions are strong ( more durable ) at up to 500 ma.This is a direct replacement / upgrade made by the manufacturer ( Autotrol / Pentair Water ).Used with the 440i low voltage, 460i, 460TC and all Logix electronic timers ( and a few other timers - include older 960 and newer 740 and 760 Logix ). Also, Autotrol 368 valve ( possible cross reference = 258100 ).Plugs into a small jack located on the Timer.