1. Crank by hand for power.2. High brightness: Max brightness: ge;45000MCD3. Convenient usage, never needs battery, just need cranking it for power4. The head of lamp can be circumrotated plusmn;54deg;,it is practical and convenient5. Accessorize a bicycle kickstand, it can be used directly and dividually, and enlarges its practicality6. Delicate exterior7. Size: 100*50.1*41.95 mm8. Weight136 g