From Bill Childs on Twitter:
“WARNING: Cycling can be dangerous. Bicycle products should be installed and serviced by a professional mechanic. Never modify your bicycle or accessories. Read and follow all product instructions and warnings including information on the manufacturer’s website. Inspect your bicycle before every ride. Always wear a helmet and use lights at night. Failure to heed any of these warnings may result in serious injury or death.”
Which, as Bill says, seems a bit much for a warning on a bicycle bell.