The Winmau Laser Oche is a high tech solution to the dart mat, or putting sticky throwlines on the floor. This device is a sleek design that is perfectly adjustable, all you need to do is move the laser body up and down. Projecting a perfect beam, you can easily see your foot when it is over the line. Easily attaches to a wall or Cabinet. Battery operated (not included) (Visibility may depend on flooring type and room brightness).