Ok, video is a problem as I struggle to upload simple photos.
At the time I got mine they offered (as I recall) three models, constant flash, flash three times then constant, and flash three times then constant with an 8-10 second delay on the flash only (constant always works) on a second brake application. The idea on the last one is if you are in stop and go traffic the triple flash isn't going off (in the face of the driver behind you) on repeated, quick, brake applications. I got the third one. I connected it to the hatch mounted stoplight but you can hook it up just about any way that you want. It's self powered, no separate power source is required. The flash feature looks "normal and natural" if that makes sense, my wife even liked it.
KAHTEC Blinking Smart Stop PN# 301-2003-11f. $29.22 delivered to So. Cal.
Supplier: Alan Humphrey
ach911@austin.rr.com
I got mine in August of 2010 so I don't know how current this info is.