No, once you install the batteries, it keeps blinking until the battery wears out. And also NO, this unit has no motion sensor. The battery is used to operate the only one red LED light that blinks, that is, it will last forever, therefore no need to switch on and off.
No, it has neither. You must provide the batteries which turns on the LED once inserted. With a new set of batteries (2 AA), I've yet to get them last longer than a month. I will say it looks pretty real though and it even fooled a police officer.