About a year and a half ago I bought a cap from Menards that has two LEDs built into it. The batteries were pretty dead, so I stopped by the Dollar Tree Store at the Mall Of America, since I was shopping there anyway. It is powered by 2 CR2032 button cell batteries. The pair of them was a dollar, so I thought that was worth it. Close by is Radio Shack. They wanted about $12.99 for three CR2032 button cell batteries. Anyway, I started researching caps with built in LEDs. I found http://panthervision.com/ has a lot to choose from. Are there others besides this company? I see these at home improvement stores, Cabelas, and Gander Mountain. I want to get another one that has at least 4 LEDs. Has anybody seen any that have more than four LEDs built in? Also, are the CR2032 button cell batteries the most common ones for LED caps?