Just tuck these into your bookshelf and watch your guests jump when they pass by and the books start moving and making eerie sounds! The books slide in and out on their own and are motion activated. Great addition to your haunted setting! Clever funny author's names include Yul B. Next M.T. Toombs and more! Requires 4 AA batteries not included. Made of Paper,50%; Plastic,40%; Metal,5%; Electronics,5%. Measures approximately 8 inches tall, 6 inches wide, and 7 inches deep.