Applicability: Press the 220V switch to use electrical appliances within 20W in an emergency, such as mobile phone charging, energy saving lamps, LED lights, and stereos. Hand Cranked Power Generation: To ensure normal power generation, 1-3 revolutions per second is sufficient. The faster the hand cranking, the greater the power generation current. The generated electricity is stored in the built-in power lithium battery pack, and both forward and reverse hand cranking can generate electricity. Safe: The built-in battery pack has a protection circuit to prevent overcharging. With Indicator Light: When charging with the charger, the charging status can be observed via the indicator light. The light is red during charging and turns green when complete. The 220V switch can also be pressed to check the power. Multipurpose: Suitable for outdoor camping, backcountry survival, hiking, walking, and night riding.