I bought one of these a while back. Best light ever.
THEN... I placed it on my back bumper (the rear bumper guard 911), drove out of the neighborhood, and it flew off my bumper, only to get crushed by another car.
DEFEAT.
BUT... , I rode up a road last week, and found one that had fallen off someone's bike on a descent. Before IT could get crushed, I 'adopted' it and put it on my bike.
Very bright blinky. still binking. It needed home. Fit right into my previous one's empty seatpost mount.
VICTORY.
Edit- you can get some really high power versions of this light if you go to the cygolite website and pay a little more. Highly recommended. Good stuff.
Warning-
These can blind your brain.
https://www.rei.com/product/110181/cygolite-hotshot-sl-50-rear-bike-light?sku=1101810001&CAWELAID=120217890003179979&CAGPSPN=pla&CAAGID=107744801264&CATCI=pla-452552815162&cm_mmc=PLA_Google%7C21700000001700551_1101810001%7 C92700053575966326%7CTOF%7C71700000066691934&gclid=CjwKCAjwrdmhBhBBEiwA4Hx5gxMk6_SWgR9bXeQu2Pa4 wghT9x7LsBMj7_Nv7p9aI3-idE3VpbJSUxoCzVsQAvD_BwE&gclsrc=aw.ds