... output current:1000mA Rachargeable battery:3.7V,300mAh Bicycle Dynamo Generator :Features:Bicycle chain drive the dynamo's gear to generate ... mobile phone, bicycle music box, flashlight, etcEnergy saving, no pollution, green products.Over-charge, over-temperature, over-voltage, over-current protectionSpecial ... adjustment holder(Patented), suitable for speed-variable bicycle Bicycle Dynamo Generator