Built to have an outstanding power capacity of 5000mAh, the external power case was designed exclusively for the Samsung Galaxy Note. The external power case is ideal and convenient for all Samsung Galaxy owners because it continuously charges your smart phone with the touch of one button and serves as a protective case for your device. The external battery case protects the exterior of your device through day to day activities and accidental drops. Use a USB cable to charge power bank then you will be able to power up anywhere. Hit the on button that is located on the back of the case and start charging your device. Ensure your battery life with the rechargeable power case that lasts up to 4 hours.