XINCOL 30A 360W Volts Reducer DC/DC Car Truck DC 24V to DC12V Buck Converter Step-Down Transformer with Built-in Fan Full Protections Inside Memory RAM and Inline Fuse Car Power Supply Transformer allow you to convert DC 24 voltage to DC 12V voltage.Brand new and high quality,more than 90% power conversion efficiency Built-in over/under voltage input, overload, overheat, and short circuit full protection Ultra compact size, light weight Operating Stable and reliable performance Auto-recovery when device is back to normal operating Simple to install