Bicycle Rear Light,Self-Powered Bicycle Tail Light with Magnetic Induction Generate Electricity, No Battery, No USB Charge, Easy to Install Night Safety Flashlight

I like the concept of magnetic induction for a battery-free light. The problem is that the magnets supplied to attach to the spokes do not secure adequately. In fact, the magnets are so strong that they move around the spoke, and also can dislodge the light itself. The unit has already fallen off during a ride, but I was able to retrieve it.

Other trash that Amazon sold me. It is a nice idea, but is no way to attach this light to any bike

Nifty, works great. Easy to install.