A great device! Dial in the exact voltage you need ! Adjusts Voltage/Brightness down to what you need for your electronic devices requirements. LEDs (current limiting resistors or led driver are still recommended for leds) 3 amps peak 1.8 amps working power, enough for 100 LEDs. (The kit includes a voltage regulator, rectifier, 1000 uf capacitor and 6-6" sections of 22awg wire and 6" of heat shrink.) The regulator caps your adjustable voltage to your preset voltage using the screw on the board.  The rectifier protects the polarity of the board (Reversing train) and converts DCC, AC or poorly filtered DC to DC. The capacitor helps keep the lights lit over track gaps, dirty track . Input 4-28 volts AC,DC, DCC Output 4-27 Volt DC
We sell led strip lighting message us for a quote, we combine shipping, you pay $2.95 no matter how many items you purchase. 😀