Davis Unified Ignition (D.U.I.) Mini-VP 18 Volt Transformer is an 18 volt step-up regulator that works with any 12 volt battery. A simple 3-wire hookup sends 18 volts right to the ignition system. This regulator prevents the common voltage drop and allows a larger spark plug gap to .070"-.075". With a small size of 3" x 2" x 2" and weight of only 1 pound, this transformer can be mounted virtually anywhere, in-sight or hidden. A moisture proof silicone helps protect the Mini-VP from moisture and vibration. No need for an extra battery, the Mini-VP 18 volt transformer delivers the voltage needed for any and all racing applications.