These power supplies are great for providing DC power to onboard equipment, including single side-band radios, radar rectifiers, halogen and other lighting systems without using your battery. They provide a constant 14.4V DC and accept variances in AC input (120V AC units: 90 to 135V AC, 220V AC units: 180 to 270V AC) without degrading output. Constructed with corrosion-resistant materials and a heavy-duty, anodized aluminum enclosure. Made in the U.S.A. One-year limited warranty.