Tells the time and date as well as functioning as a Stop Watch. Big numbers allow for easy reading of the timer. Each Sport Timer has a nice rope cord to hang around the neck while in use. These sport timer stop watches also comes with a lithium battery and a great gift box with a see through window for easy retailing. Each piece is 3.75 x 2.5 inches. Batteries are included. These cannot be manually turned off. Battery size is LR41.