Description of goods in details Dynamo lights Working principle: This product adopts the principle of generator generates power with hand cranking to charge its built-in 40 mAh/3.6V storage battery, the storage power then be used for lighting Product functions: Cranking for power generation be used for lighting. Product features: 1.Cranking for power generation 2.Good cranking handle, high power generating efficiency. 3.High brightness lighting: the Max brightness can reach 45000 mcd. 4.Convenient to use, never need change battery, cranking to recharge. 5.Unique design, lightweight size, convenient to carry.