Backyard Flashing BailsExperience the thrill of Zinging your friends at home… at school… in the backyard… at the beach, or even in the office! For use with children 8 years and over under adult supervision. Designed for soft rubber and tennis balls. Box includes two Zings that fit any set of stumps, and take 2AAA batteries per Zing. This product is obviously not the high tech system used in TV cricket, but an economical version designed for fun in the backyard with your kids and mates.