What would you do in an emergency situation when you have no power on your mobile phone? Or during a power outage? Charge your USB cell phone or other USB devices yourself! Ideal for travel, auto/boat, outdoors and emergencies. This USB device is the perfect solution for these scenarios and more! Compact, small and reliable, this USB Charger is powered by you simply winding the handle to generate the power you need to make a quick call or send a text message! Or charge your favorite USB MP3 player and listen to some tunes!