Emergency Dynamotor For Camping And Outdoor Survival, Manual Hand Generator, ??Long life?--Easy to generate electricity; Light weight; Miniature metal casing, anti-corrosion, anti-oxidation, prolong product life; ??Fluctuation speed is fast? - The faster the oscillation speed, the larger the power generation, the faster the oscillation speed, the higher the generator voltage, the larger the power generation. ??energy saving? - The generator is very energy efficient, does not require unnecessary charging, and saves electricity costs. It is very environmentally friendly and safe to use at home. ??Performance stability? - The output voltage of the manual generator must be greater than the set voltage to stabilize the output. Robust construction, low noise and stable performance. ??Application? - USB Generator can be actively used in the field, field operations, field trips, rescue operations, natural disasters, survival training, emergency communications, long-term power shortage, tourism, emergency power supply and other fields.