The product KVAR US-1 is UL listed, CSA approved and Energy Star certified. The KVAR Unit is backed by a 5 year warranty. The KVAR US-1 is based on patent # 5,440,442 manufactured by KVAR Energy Savings INC. We at Energy Boxx are proud to distribute single and 3 phase power factor optimizers that reduce your electric consumption by at least 10 percent and as much as 25 percent. The KVAR Unit is a capacitor that reduces the watts you use on your wires. Thus, lowering your electric bill. These units also surge protect your entire home or business. Energy Boxx is quickly becoming the leader in power conservation worldwide.