feature: Dual USB ports can charge two devices at once. With a total of 3.1A USB port, it can output current intelligently according to the charging product. When charging the phone, it may output 1.0A, and when charging the iPad, it may output 2.1A. When charging, the LED display will show the amperage. Intelligent charging technology can identify devices that provide the best charging efficiency and prevent overcharging, overheating, and overcurrent. Additional intelligent circuit design can quickly cool down to prevent overheating, overcurrent, overvoltage and overload of car chargers and equipment. specification: Input voltage: DC12-24V Intelligent output voltage: 5V 3.1A / 2.1A Material: PC fireproof + aluminum alloy + zinc alloy Compatible with all devices with USB ports Apple iPhone 7/7 Plus / 6S / 6 / SE / 5S / 5C / 5 / 4S / 4 / iPad 2 3 4 Air 2 Mini / iPad Pro Samsung Galaxy S9+/S9/S8/S7/S6/S6 Edge/Edge Plus, Note5/Note4/S Tab/S5/S4 Active Mini Google Nexus 6, Pixel / Pixel XL Motorola Droid Turbo, Moto X 2014 Sony Xperia Z4 / Z4 Tablet, Z3 / Z3 Compact / Z3 Tablet Compact LG G5, G4, LG G Flex2, LG V10, LG G tablet HTC One M9 / M8, HTC Desire Eye, HTC One, Amazon Fire Phone, GPS Package Included: 1 dual USB car charger