With standard 0/4/8 AWG gauge, this product allows multiple wire sizes to connect to the same terminal for secure attachment to the car battery, offering a safer and more organized installation that fits perfectly on the battery terminal. Equipped with a 12-24V voltmeter with less than 0.5V error, it accurately displays real-time battery voltage for easy monitoring of battery status. Constructed from high-quality alloy material with pure copper tightening rings, it ensures excellent electrical conductivity, enhanced durability, and protection against terminal corrosion to help extend battery life. Features transparent acrylic covers that effectively shield connections from dust and environmental damage, providing added protection for wires and terminals. Designed with strong versatility and a standard 17.5mm universal fit, compatible with most international automotive battery terminals.