... Max output current:1000mA Rachargeable battery:3.7V,300mAh Bicycle Dynamo Generator :Features:Bicycle chain drive the dynamo's gear to generate ... LED indicate light, it flash when charging, also can be used as tail light when riding.Rainproof design, no need worry ... entry at raining days.Supply power to your mobile phone, bicycle music box, flashlight, etcEnergy saving, no pollution, green products. ...