Charge your device quickly and efficiently while traveling! This 2-port USB car charger works with MP3, smartphone and tablets including iPad, iPhone, iPod, HTC One, Nexus 4, BlackBerry, Samsung Galaxy Tab/Note, and Android devices. It has smart chipset that recognize what type of devices is connected for proper charging and auto-allocations that allows it to operates as dual-port with 1.5Amp each port if two devices are connected or single-port with 2.1Amp for faster charging. Features built-in over-current and short-circuit protection with LED status light. FCC, CE, e-Mark and RoHS compliant. (Connectors: 2 USB A Female / Input Voltage: 12-24vDC / Output Voltage: 5vDC 3.1Amp)