Provide your game with peak precision using the Laser Throw Line & Power Adapter Bundle! This hassle-free setup - and the superior results it yields - will make you wonder why you ever bothered with physical markers! With the Laser Throw Line, the need for adhesive throw lines or dartboard mats is eliminated at the mere push of a button. This accessory shines a concentrated beam of light onto your floor to mark your throw line, which can then be adjusted to shine at various points across the room. It also fits on any cabinet, comes with mounting hardware, and runs on four AA batteries for a neat, cordless presentation, although you can opt to use the power adapter that comes with it if you'd rather save money on batteries.