Dual USB Ports pumps out 24W of power charge up to 4.8 amps or 2.4 amps per port. Easily charge your favorite mobile devices including the for , for , for , , Galaxy, Blackberry, MP3 Players, Digital Cameras, PDAs, and Mobile Phones. LED digital luminescence tubes; Monitor the voltage of the vehicle's car battery when not charging any devices. When charging a device, it cycles between device's charging current, and the voltage of the vehicle's car battery. The LEDs are bright enough to read the display without being a distraction while driving. The mini USB car charger is auto power off when input/output is safety current, protects against over-heat, over-current and over-charging One of the industry's smallest USB car chargers, featuring two USB ports and an LED Display easy to access after dark. Input Voltage: DC 12V-24V Output Voltage: DC 5V Output Current: 4.8A(2.4A+2.4A) Conversion Rate: 95% Material: PC colour: black Package Contents: 2 x Multifunctional car charger Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.