A little piece of foam stops the rattle and 2 9v lithiums will last a long time. I've used the same pair through 2 tournaments + a practice + they're still going or the good Powerex rechargables will easily last you all day and are cheaper in the long run. Plus, it shaves almost 3 ounces off your halo--sad, I know but I actually weighed them all out on a digital scale. Some people will say thats not worth it but I use a matrix so try to save weight wherever I can.