Uses a high power daylight-visible laser and a high-strength magnetic connection to the barrel to deliver fast accurate bore sighting. System works with virtually all firearms. Machined aluminum body with soft rubber over-molding houses the laser module. Each unit is hand tuned during the manufacturing process with an innovative calibration mechanism. Allows for maximum precision ensuring the best bore/optic alignment possible. Molded plastic storage case included. Runs on a single Lithium 123A battery (included).