"A laser is the only toy that my fat cat will enjoy, and I was sick of buying the "keychain" ones because they die so easily and they are not very intense.
The automatic timer is pretty good. It moves pretty fast in case your cat sits in its line of fire with their eyes they won't be harmed. However, the pattern it moves is pretty random and gives a 'teasing' sort of motion, stopping at random intervals for only a moment. My cats seemed bored for a little while with it since it is quite fast, even in a small room. However, it does keep their interest up.
The thing is pretty big, the length of my forearm. Make sure you buy 4 AA batteries for it.
YOU MUST watch your cats even with the timer though, because if your cats are as smart as mine, they know they that the laser is coming from it and will try to look into the mirror, since it makes a small noise too. But even my spastic cat enjoys it, so I would recommend it to any pet owner!"