【RAPID 16-HOLE DISCHARGE】Featuring a unique dual-sided 16-port nozzle structure, this smart automatic system floods any enclosed space in under 10 seconds to rapidly suppress and suffocate electrical fires before they can spread. 【AUTOMATIC FIRE PROTECTION】Designed for electric vehicle owners and DIY solar enthusiasts, this black device automatically activates inside closed car engine bays or lithium battery compartments to suppress thermal runaway hazards instantly. 【WIRE-FREE THERMAL SENSING】Requiring zero external power or wiring, this smart device relies on integrated thermal-sensitive cords to trigger suppression. Its compact round shape fits easily into distribution cabinets. 【ALL-WEATHER RELIABILITY】Engineered to withstand extreme operating environments from -50°C to +110°C (-58°F to 230°F), this black system offers a five year maintenance-free lifespan to deliver continuous and worry-free fire protection. 【COMPACT MOUNTING】Perfect for overnight protection of RV batteries or fuse boxes. The 7.8 x 3.2 cm / 3.07" x 1.26" painted metal puck features a sticky backing for instant tool-free installation in tight, enclosed spaces. Package list: 1x Fire Extinguishing Sticker Device