Function: 1. 2. za hand crank power generation: To ensure normal power generation, 1-3 revolutions per second is enough. Im faster the crank is turned by hand, the greater the power generation current. The generated electricity is directly stored we with a built-in lithium battery, and a manual crank forward and backward can generate electricity. 3. Safe: Because the built-in ma protection circuit, it does not ma need to worry about overcharging. 4. With indicator light: when charging za the help of the charger, you can observe the charging status according to the indicator light on the charger. When the indicator lights up red, charging is in progress, the indicator turns green and charging is completed. In addition, you can also press the 220V switch to check the power. 5. Versatile: Perfect for outdoor camping, off-road survival, hiking, walking and night riding. Specification: Item Type: Generator Hand Crank Product material: ABS, aluminium, stal stainless steel Voltage: DC 220 V, DC 12 V, USB 5 V Output Power: 30 W Power generation: 20 W Output Current: 3A Emergency light: Hand crank for half 1 minute, lighting for about 1 hour (continuous lighting for 24 hours at normal power) Battery: 6600mAh polymer lithium battery (included) Product Size: Approx. 23,5 x 12 x 8 cm / 9,3 x 4,7 x 3,1 inches Weight: about 1654g / 58,3oz List of packages: 1x generator 1 x User Manual 1 x Manual Rocker Note: When the uninterruptible power supply is not used for a long time, it should be charged once every six months so that the built-in battery does not lose power.