THERE ARE SEVERAL MORE DEALS UNDER $20 BELOW. A battery life of 10 hours will give you plenty of play time, and since it weighs less than 8 ounces, you can take it (and your music) with you anywhere. The mouse has up to 24 months of battery life and an included battery indicator, so you’ll know when it’s running low. It also has an ergonomic design and is lightweight, so you can bring it with you wherever you are working.