Buzz Lightyear Costume Light For Buzz Lightyear Costume?

Light for Buzz Lightyear costume? - buzz lightyear costume

I'm trying a suit of Buzz Light year Halloween make next year. (I know it is early), but I need a red laser light through his arm, and I'm not sure what kind to get. I would like to replace a battery in connection to and activate a switch. Where can I get a red light is very bright, but outside a battery? And it is a special type is better? Or a laser pointer to be better? Suggestions would be helpful.