I have a pair of these, so I can answer some questions. In response to Tapeworm21:

A: If you have SL100's, they stop when you stop. If you have SL120's (as I do), they flash for a good few minutes after you stop. The downside of the SL120's is that the flash frequency is fixed and nonadjustable (I'd like to increase it, but it's not a big deal).

B: Do you have lights on your hands? These are see-me lights for night riding - they're not turn signals.

I'm happy to provide more info - feel free to ask!