1. Wide Application: This generator can be used for many appliances, like mobile phone chargers, energy saving lights, LED lights, etc. The USB 5V interface outputs DC 5V 2A power supply, direct charging mobile phones, etc. 2. Using Instruction: To ensure normal power generation, 1 to 3 revolutions per second is enough. The faster the hand cranking is, the greater the power generation current is. 3. Easy Operation: The generated electricity is directly stored in the built in power lithium battery pack, both positive and negative hand cranking can generate electricity. 4. Light Indicator: When the indicator light is red, the charging is in progress, the indicator light turns green, and the charging is completed. In addition, the power can be checked by pressing the switch. 5. ABS, Aluminum, Stainless Steel Material: Made of premium material, this generator is strong and sturdy, impact and rust resistance, which ensures a long life span. Item Type: Hand Crank GeneratorProduct Material: ABS, Stainless Steel, AluminumWeight: Approx. 1626 g / 57.4 ozOutput Power: 30WPower Generation: 20WVoltage: DC 220V, DC 12V, USB 5VBattery: 6600mah polymer lithium battery (shipped with built in battery)