The AixiZ Line of Sight Laser is specifically designed for use with Tabletop Wargames, a simple click button on the top draws a red line from above and gives no doubt on any line of sight issues! Measuring 5 inches in length with a handy wrist strap, these lasers are a must have for any wargamer... Supplied with presentation case and 2 CR2 battleries Specifications: Class IIIR Laser 650 nm wavelength