Viper ProScore Digital Dart Scorer Brings all of the exciting games you find with electronic dartboards, and makes them available for steel tip dartboards Features a large, backlit LCD monitor that can easily be seen from the throw line Fun for up to 8 players, with 40 games to choose from and 655 game options, including setting custom handicaps Designed with an auto-off mode and a sleep mode to help save battery power; The soft keypad allows for clear and easy operation Measuring 5" L x 1.5" W x 10.25" H, the Viper ProScore is battery operated, which requires 3 AA batteries (not included)