This adapter can charge 2 USB devices simultaneously. Simply connect the included USB cable to your phone and then to the charger module. Now you still have an extra USB port to charge another device! Digital cameras, high tech accessories, PDA and MP3.. etc. This apdater is a world traveler (100-240V), it automatically adjusts to all voltages and frequencies in the U.S., Europe, and Asia. LED charging indicator shows charging status. Patented circuit board design to protect your valuable gadgets from short circuits. Type: Charger & Adapter Compatible Phone Manufacturer: HTC