Tested and recommended by the National Tactical Officers Association, the SightmarkA(R).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. US Pat. D772372S1 Included in Package Battery Pack Carrying Case Batteries Used Type: AG3 Quantity: 3 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