Effectively reduces the E1 error code caused by insufficient voltage. (Notice:?The battery protection function of the refrigerator will no longer be effective after using this booster) High efficiency--Power input 9-13.5V DC boost voltage converter, boost power module output DC 13.7-14V, maximum current 8A,using synchronous rectification technology to improve conversion efficiency, efficiency up to 93%, no delay start. Safety--Overvoltage protection, overcurrent protection, overheating protection. IPX-7 level waterproof,?full-body die-cast aluminum shell and organic silicone seal design, waterproof, shockproof, moistureproof and dustproof.