1. Input: DC12-24V. 2. USB output: 5V/2.1A , 2USB output. 3. Materials: ABS+PC flame-resistant material, anodic oxidation treatment for aluminum shell. 4. USB Total output 2.1A+1A=3.1A , two-port intelligent balance splitting technology. With digital display car battery voltage / car charger voltage / car charger current. 5. Over-current and overvoltage multi-circuit protection. 6. 6.2cm*3.6cm*2.6cm (Length*Width*Height), Weight: 21g.