Use your cigarette-lighter outlet to charge any devices that can rely on USB for power! This adapter can charge two USB devices simultaneously. This adapter is a DC to DC power transfer device. Compact and lightweight design tucks away easily into a purse, briefcase or carry-on. Powerful output (5V, 2.1A) is ideal for charging the most recent devices such as iPad, iPad2, iPhone 3GS, iPhone 4, iPhone 4S, iPhone 5, iPhone 5s, iPhone 5c, iPhone 6 and 6 Plus, Galaxy, HTC, Droid, Amazon Fire Phone, GPS, and other tablets, smartphones, etc.