SPINUP F12W-PRO Bicycle USB dynamo is the first bicycle dynamo with Intelligent Power Management System(IPMS).
 
It controls power output according to your riding speed and provides touring devices with a stable electric current at 1000mA, even when you briefly stop for a traffic light. You can feel free to charge your iPhone or GoPro directly.
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At speeds less than 4 MPH there is no power production.
4 MPH to 9 MPH power productions comes from Cache Battery.
Speeds greater than 9 MPH 5v1000mA of electricity are produced directly and charges the cache battery.
 
Included with your purchase is:
The Dynamo
USB charging port
All mounting components
Spare parts package
Installation Instructions
1 year limited warrently
 
Product Facts:
USB Charge Current: Stable 1000 mAh 
Waterproof: Yes IPX4
Installation Location: Front
Weight: 370 grams
Rebuild wheel: No need
Installation time: 5 to 10 minutes
Warranty: 1 year limited