Does anyone know if there are any laser pointers out there with an on/off switch that actually stays "on" without you having to hold down a button? My fairly new laser pointer I bought for the cats at PetSmart doesn't work anymore....and the problem is the button. Sometimes, my finger starts to hurt when I'm playing with the cats since you have to hold the button down for the light to stay on. I'd like to find one that you can switch it on and you don't have to hold anything down!