You only have to spin the handle on this device to produce electricity to charge your devices! Basically any device with a USB port can be charged by this device! No need for electricity or plugging in an outlet! This device is great for the following purposes:

1. When there is a brownout or there is no electric outlet nearby and your device is running out of battery.
2. Educational device to demonstrate transfer of mechanical into electrical energy.
3. As a novelty gift for your loved ones.

Depending on the device, 3 minutes of spinning can give you up to 10 minutes of phone call time which is great if you are in an emergency. Get one now while supplies lasts!