Your young ninjas and their friends can keep track of their time when competing in their own ninja games with the Slackers Ninja Timer. Large, easy-to-read digital display shows their time as they hit the button. Mount the timer to an existing structure, 4x4 post or tree with the included hardware. Runs on three AAA batteries (not included). Ages 5+. 4.4L x 4.4W x 4H. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Outdoor Games & Toys.