Server power supply puts out 12.5 volts at up to 47 amps. Pre-wired with sturdy banana jacks/binding posts. Internal fan runs always. No switch. Uses a standard computer power cord, not included. Dimensions 2.25 x 3.125 x 14 inches.
I have had 2 of these for 6 months to power my Hyperion EOS 0720i SUPER DUO 3 at 24v. Even though they do not have power switches, you can regulate them by using surge protector, which I highly suggest. If you use them in series I DO NOT recommend plugging them up separately, the power draw blew a house fuse. The fan is a little loud, but it is worth it for the price. Based on average kw/h charges, it only cost $2.80 to run 2 of these for 24 hours a day for 30 days!