ICE
Oh Well
I didn't know that these existed until today. This one is the size of a shot glass.
http://www.firstalertstore.com/store/products/first-alert-atom-photoelectric-smoke-and-fire-alarm-p1000.htm?gclid=CN2RqOjOuLsCFQbl7AodD1oA7g
http://www.firstalertstore.com/store/products/first-alert-atom-photoelectric-smoke-and-fire-alarm-p1000.htm?gclid=CN2RqOjOuLsCFQbl7AodD1oA7g