Calex Mfg. Co., Inc., headquartered out of Concord California, specializes in high density, high efficiency DC DC converters from 1 watt up to 2.1 kilowatts. Calex has been in business over 50 years and is known for highly reliable leading edge solutions for the ground mobile, industrial, rail and COTS military markets. All Calex products are backed by a Five Year Warranty and are manufactured in the USA.