The latest high tech innovation in dart throw lines is here in the Viper Laser Dart Throw Line! Never worry about sticking throw lines down to your beautiful floors again as the Laser Throw Line projects a concentrated beam of light to indicate where you should be standing. The adjustable laser light allows you to place the line at any height, and you can project it to any distance, perfect for players of both steel tip and soft tip darts. The Viper Laser Throw Line mounts quickly and easily to any wall your dartboard sits on with included mounting hardware. The throw line operates on four AA batteries for a great cord-free look! Sticky throw lines are a thing of the past with the Viper Laser Dart Throw Line! A high tech way to mark your dart throw line. Perfect for players of both steel tip and soft tip as the line is adjustable. Set the marker once and there’s no need to worry about moving or adjusting once the game starts. Mounts quickly and easily to the wall, mount once and never think about it again. Powered by four AA batteries for a cord-free experience (Not Included) Optional AC Adapter available.