EPM-01 Mini LED dynamo keychain light

EPM-01 Mini LED dynamo keychain light
Simply turn the crank to charge this promotional keychain flashlight and power the extra bright double LED light. Fits perfectly in pocket and never needs batteries
ABS material  
Size: 3.3*1.56*4cm  
1,  LED: 2 , 15000 mcd                                                  
2,  1-2 minutes crack could  produce up to 6-8 minute lighting 
3, Battery voltage: 3. 6V, capacity: 20mAH. 
4, weight, 20 g