Aimshot bore sight.22lr w/ external battery box red FEATURES-Caliber: .22 Long Rifle-Provides the extended run time that the traditional bore sight cannot-Offers the most economical solution for all your bore sighting needs-Intended for use of only open chamber applications Other Features: Battery box uses 2 aaa batts runtime approx.20 hours wavelength 650nm battery pack wire length approximately 3"