The Sightmark Laser Boresight provides the most convenient and accurate method for sighting in rifles and shotguns of all types. Simply chamber the boresight like a regular bullet and a laser dot will show exactly where the rifle is aiming. Its easy to sight in any scope without firing a single shot. Live fire is only needed to fine tune the weapon being sighted in order to compensate for inconsistencies, such as bullet drop due to distance. Perfect for hunters, competitive shooters and law enforcement, the Sightmark Laser Boresight is sure to take the frustration out of sighting in almost any gun. Its easy to use and will quickly save both time and money by avoiding prolonged live fire tests at the range use the extra ammo for honing those shooting skills and for the hunt. The external battery pack has a magnetic base that easily attaches to your firearm for hands-free use. Sightmark-Make Your Mark! Features Precision accuracy Reliable and durable Fastest gun zeroing and sighting system Reduce wasted cartridges and shells Compact and lightweight Easy to pack and travel Long battery life Included in Package Batteries Carrying Case Specifications Laser Wavelength nm 632-650 LED Type Visible Redd Laser Power mW 5 Battery Type 2 AAA Battery life Approximately 30 Hours Range for Sighting yd 15-100 Dot Size 2 100 yards Operation External battery pack with slide switch Construction Brass Temperature 10 50 SOLD QUANTITY 1