This JD1912 Waterproof Automotive Relay is a reliable 12V, 40A, 4-pin relay designed to handle demanding electrical applications in vehicles. Built to withstand harsh weather conditions, its waterproof construction ensures consistent performance whether you're dealing with rain, dust, or extreme temperatures. The relay features durable copper terminals in black and red, providing stable conductivity and a long service life. With a compact body measuring approximately 1.1 x 1.2 x 1.0 inches and a mounting bracket for secure installation, this relay fits neatly into standard 12V automotive electrical systems. The included relay socket with pre-wired leads (approximately 5.2 inches long) makes installation straightforward — simply plug in and connect. Its high 40A current capacity makes it suitable for powering lights, horns, fans, fuel pumps, and other high-draw automotive accessories. This pack of two relays ensures you always have a spare on hand for future projects or replacements. Ideal for DIY automotive enthusiasts and professional installers alike.