About this item 30 Amp Surge Protector with Waterproof Cover：It can prevent serious problems with your trailer or RV caused by improper wiring or power supply base failure, avoid high-voltage spikes up to 2100 joules, and protect your RV electrical equipment from dangerous high/low voltage electrical interference and sudden thunderstorms the impact of power surges. Escort your Power Supply：Circuit analyzer with LED indicator, integrated surge protection. Diagnosis lamp, used to visually indicate faulty wiring faults. Designed for outdoor use, weatherproof, all-weather protective cover assembly. Thoughtful Design：The strong anti-theft rings can lock the bracket and contour handles makes it easier to insert and pull out. Reliable RV Surge Protector：The 3-level complementary surge protection circuit composed of TVS, MOV (metal oxide varistor), and GDT (gas discharge tube) has a minimum energy absorption capacity of 2100J and can quickly and reliably protect your equipment level MOV (metal oxide) Varistor) surges protection circuit. Happy Experience: If you are not satisfied with our products, you can contact us at any time for a full refund. We value our customers and hope you enjoy a pleasant shopping experience!