The manual crank generator is for emergency at outdoors, provide power for your phone, computer, power bank, etc. It is absolutely a good helper for your travel of outdoors. Specifications: Model: F20 Material: Metal Color: Blue Max Power: 20W Rotating Speed: 2000rmp/min Voltage/Current: 3V/6.6A, 5V/4A, 6V/3.3A, 9V/2.2A, 12V/1.6A, 15V/1.3A Output Voltage: Max 28V Item Size: 19.5 * 17 * 8cm / 7.68 * 6.69 * 3.15in Package Weight: 820g / 28.92oz Note: The faster the rocking power, the higher of the generation power and voltage. Shake the generator output voltage must be bigger than the setting voltage to regulate the output voltage. Please adjust the voltage to 5V before you use USB interface. The crank generator can charge for Android phone. The charging time mainly depends on the battery capacity of phone.If the battery capacity of mobile phone is 2000mAh, it would take about 4 hours to fully charge. Mainly charge for portable instruments such as low-power communication station, interphone, notebook computer, PDA, mobile phone, camcorder, digital camera, music CD, MP4, MP3, portable mobile TV, DVD, radio, flashlight lighting, all kinds of lamps, power tools, automobiles and various types of measuring instruments. Can charge directly for lithium battery, nickel-metal hydride battery, lead-acid battery and other types of batteries. Package List: 1 * Crank Generator