Features: Include AD1210P battery and regulator board to provide stable power supply for LB120D car computer during vehicle operational. High safety and long life preventing power surges and protecting vehicle batteries from drainage. Automatically detects to switching power sources seamlessly between vehicle generator and backup battery for uninterrupted operational. Built in safeguards against overvoltage, undervoltage, overcurrent, short circuit and reverse connection for device protective. Ideal for commercial vehicles and special equipment requiring stable power supply, driving and engine off situations. Specifications: Component:Metal Size:Approx.102x50mm/4.01x1.96inch Package Includes: 1Pc Power Board note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.