✔ 50 AMP SURGE PROTECTION - Absorbs high-voltage spikes up to 3150 Joules and 45000A max spike, and protects the RV electrical equipment from dangerous high/low voltage, electrical disturbances, and sudden power surges due to thunderstorms..✔ ULTRA-SAFE EQUIPMENT - Carmtek 50A RV Surge Protector comes with ETL certification. Being built from flame-retardant material makes it extra safe to use. The electrical plug pins are made of an integrated thicker copper sheet, providing great conductivity..✔ SMART LED INDICATORS - Our Surge Protector Adapter features two LED indicator lights, "POWER" and "SURGE", which can show you the connection status and whether the surge protection is activated. The RV is under surge protection ONLY when "SURGE" light is on..✔ PORTABLE & EASY TO USE - Designed with you in mind, our RV Surge Protector's convenient anti-slip design increases friction and makes plugging and unplugging much easier. Convenient to carry and easy to store. The surge module can even be left connected to your cordset so you don't have to worry about leaving it behind..✔ NOTE - Before purchasing the Surge Protector Module, please confirm that the RV charging cable is suitable for the 50 AMP. The Surge Protector Module must be used in conjunction with a circuit breaker rated 50 AMP, 125/250 VAC!