... hand cranking 4)Product size:53*40*22mm promotional mini dynamo flashlight keychain Material: ABS Size: 53*40*22mm Bulb type: LEDLED ... hand cranking, cranking for one minute, can be lighting on 5-8minutesAccept OEM design Product color: have red,blue,green,white ... and OEM.It is ideal for promotinal gift, With the flashlight function,you will get lighting when you are in the ...