I purchased the ENFITNIX XLite 100 Smart Tail light for my bicycle. Since I can't see it while I am riding and I have not remembered to ask those riding behind me (of which there are very few) I do not know how this perfroms. I do know that I have it set on automatic and I have it on a table in my garage and if the table is bumped or very slightly touched the light recognizes the motion and turns on.
Since I could not find the manual for this thing on line and I hate keeping hard copies of manuals or anything paper, I have scanned it and added it to this link for anyone else to use:
ENFITNIX XLite 100 Smart Tail Light
