... output current:1000mA Rachargeable battery:3.7V,300mAh Bicycle Dynamo Generator :Features:Bicycle chain drive the dynamo's gear to generate ... , no need any toolsBuilt-in 300mA Lithium battery, supply power even no ridingThe gears made of abrasionresistant plastic steel, and ... , no need worry about water entry at raining days.Supply power to your mobile phone, bicycle music box, flashlight, etcEnergy ...