6 Volt regulator/rectifier for bikes with permanent magnet single phase alternators. Great modern up grade for older bikes with separate regulator and rectifiers. Unit measures 3x2" and is good for charging systems up to 200 watts. Comes with detailed instructions and a wiring diagram. NOTE: When used on Ducati singles with 3 wires (2-yellow + 1-red) the red wire is not used. Can be used on 6 volt bikes with negative or positive grounds.