A great device for our light strips, use a 9 volt battery and get 12 volts for the strips. The board is polarity sensitive, if wired backwards it can be damaged. We include a bridge rectifier so no matter what your polarity or if you hook up to DC no problem ! Just install on the input. Dial in the exact voltage you need ! Adjusts voltage up to what you need for your electronic devices requirements. LEDs: (current limiting resistors or led driver are still recommended for leds) 2 amps peak 1 amp working power.. Repurpose a higher voltage laptop or wallwart power supply. Make different voltage supplies off one power source 6" of input wire and Output wire already soldered unless you request it to come bare. OPTIONS available NOT INCLUDED !! 9 volt battery holder $1.00 (Can be soldered to the board at your request if purchased) and or screw terminals .50 for (2). We combine Shipping, $2.75 is all you will pay !!