This mask fits over one's head (an average size head I presume)

Latex mask

There is a little battery pack that has a button you press to turn on the red eyes

Red eyes will do three things (you choose) - be still, blink slowly, or blink quickly

The eye slits are very small so just beware if you try and wear it you may have trouble seeing well - but would be good over a manniquin head also.