You can charge the sub-battery while driving. Features: * Always charges the sub-battery while driving * Can also be used as a mobile terminal * Employs two easy-to-use output terminals * Warns of voltage drop with light and buzzer * Equipped with a sub-battery checker Product Specifications: Product Model Number: IS-330 Rated Input Voltage: DC12V Output Voltage: DC12V Output Current: Cigarette lighter socket 10A (MAX), Land terminal 30A (MAX) Charging Current: 10A (MAX) Compatible Battery Size: Open type 26A19～95D31, Sealed type 12M0.7～12M24 Size (mm) (W) x (H) x (D): 170 x 57 x 131 Weight: 1,000G Instruction manual and original box are included. The images are everything. Please understand that this is a used item.