PRODUCT DESCRIPTION Tested and recommended by the National Tactical Officers Association, the Sightmark.223 Boresight significantly reduces wasted cartridges and shells. Chamber the device in your .223 rifle like a regular cartridge, and a red laser dot shows exactly where you're aiming. Simply adjust your sights or scope, and save your extra ammo for the hunt. Includes a carrying case, three (3) AG3 batteries, and instructions. The Sightmark Laser Boresight provides a convenient, accurate, and cost effective method for sighting in rifles and shotguns of all types. Easy-to-use, simply chamber the boresight like a regular bullet and a laser dot will show exactly where the rifle is aiming--without firing a single shot. Perfect for hunters, competitive shooters, and law enforcement, the Sightmark Laser Boresight offers a 15 to 100 foot sighting range with a 632 to 650 nm laser wavelength. The boresight comes with a lightweight carrying pouch to protect the laser for in the field. Specifications: * Laser Wavelength (nm:) 632 to 650 * LED Type: visible red laser * Sighting Range: 15 to 100 yards * Dot Size: 2 inches at 100 yards * Operation: On/Off End Cap * Construction: Brass * Temperature: -10 to 50 Celsius * Power: 5 mW * Battery Type: two AG5 or three AG3) * Battery Life: one hour