TOOGOO 2-Port USB Car Charger Adapter Use your cigarette-lighter outlet to charge any devices that can rely on USB for power! This adapter can charge 2 USB devices simultaneously. This adapter is a DC to DC power transfer device, it can provide for a 7.5W dc output with constant voltage source. Compatible with most of the USB enable devices including Apple iphone, iPod, Microsoft Zune, cell phone, PDA, digital camera / camcorder and more. To use it with any USB devices, simply connect a USB cable (not included) to your device(s) and then to the charger module.