... 4,Imprint area:7/8"*5/8" 5,dynamo keychain light Hot selling led dynamo keychain light Material:ABSBulb:2LEDSize: 43*30MM ... Weight:22gBattery: 3.6V 20MA NI-MH battery includedFeatures1,Crank dynamo,no need replace battery2,With slide switch to turn on ... .Logo imprint available, ideal for promotion gifts Eco friendly 2led mini dynamo keychain light