Features: 1. Car battery voltage monitoring with LED display. 2. 4 USB ports supply power at the same time. 3. Built-in management chip, intelligent shunt, and fast charging will not hurt the machine. more→4. It is made of aluminum alloy material and has a streamlined design of the shell through 18 processes such as CNC machining, polishing, sandblasting, oxidation, laser engraving, etc. 5. Using high-performance main control chip 5-layer circuit protection, it is safer to use together. 6. Metal elastic contact design, suitable for cigarette lighters of different sizes, can carry 12V/24V wide voltage input, compatible with most models on the market. 7. Compatible with a wide range of matching,