Input: 12~24V; Suitable for all car models; 5V output, Suitable for cellphone, Tablet PC, etc; Housing: ABS + PC fire proof; PCB board: full glass fiber double side board, with copper sheet in both sides. Smart IC: overload, overload, overheat, overcurrent, short circuit; Voltage-regulator diode: protect charging devices; USB glue chip: high temperature resistance glue chip; Material: iron, nickel plating; Spring, nickel plating: manganese steel material, thermal-treated; Features: 1. LED display screen realtime monitor battery voltage; 2. Swing design, flexible; 3. Dual USB design; 4. 4A high current output, satisfy your needs.