High-power standby hand-crank generator. Portable hand-crank generator for outdoor emergencies, providing backup power for phones, computers, mobile phones, power adapters, etc. A great outdoor companion. Features: Hand-crank generator, a reliable emergency assistant. Energy-saving, environmentally friendly, with multiple interfaces. Multifunctional: can charge mobile phones, USB night lights, USB fans, and mobile power adapters. Durable metal casing with non-slip pads for stability. Retro design, saves effort and time. Compact size, easy to assemble, portable, no internal energy storage. Convenient for field operations, expeditions, rescue missions, natural disasters, survival training, emergency communications, power outages, and tourism. High-power emergency hand-crank generator. Specifications: Material: Metal Color: Blue Maximum Power: 20W Speed: 2000rpm Voltage/Current: 3V/6.6A, 5V/4A, 6V/3.3A, 9V/2.2A, 12V/1.6A, 15V/1.3A Output Voltage: 28V max Product Dimensions: 19.5*17*8cm / 7.68*6.69*3.15in Package Weight: 820g / 28.92oz Note: Higher cranking force generates higher power and voltage. Ensure output voltage exceeds the set voltage for matching. Set voltage to 5V before using the USB interface. Can boost Android phones but not iPhones. Charging time depends on phone battery capacity (approx. 4 hours for 2000mAh). Primarily for portable devices like lighting, flashlights, power tools, cars, and measuring instruments. Can directly charge lithium batteries, Ni-MH batteries, lead-acid batteries, and other battery types.