Praise then darkness, and creation unfinished

cattitude and I recently bought a laser pointer as a cat toy (after talking about doing this for a couple of years). julian_tiger thinks it's an excellent toy, and will even chase the light right before it's time for him to be fed. (That close to dinnertime, he tends to ignore offers of other play, such as a dangled piece of string.)

The control on the pointer we have is a single button: hold it down to shine the light. This becomes uncomfortable fairly quickly. So I'm looking for a similar pointer (small, low wattage, and probably red) that has an on/off button, so I can play with the cat without having to exert constant pressure with my thumb. Can anyone recommend a model/supplier? I looked around online for reviews, and found a few sites that would tell me about things like how long the battery lasted and how wide the aperture is (some of these were for higher-powered lasers, which I really don't need) rather than discussing the controls.