Foldable Speaker Works with iPod and other portable media players. Connects via dc 6V jack. When folded, speaker measures 4 inches wide by 2 3/4 inches tall by 2 1/2 inches deep. Unfolded, speaker measures 7 1/2 inches wide by 2 3/4 inches tall by 2 1/2 inches deep. Runs on 4 AAA batteries, not included.