ecoeco 223 5.56mm Laser Bore Sight, AR-15 Pistol Rifle Laser Sight Red Dot Laser Boresighter .22 .223 5.56mm Rem Gauge with 2 Sets of Batteries (1PC)

HOW TO USE THE BORE SIGHT? 1.Remove the back cover (turn it counterclockwise). 2.Insert 3 batteries into the back cover(+ side up). 3.Close the back cover and the laser is turned on (rotate the back cover clockwise). 4.Turn off the device (release the back cover and remove the battery). SPECIFICATION Wavelength: 635-655 nm Material: Brass Operation: On/off cap Type: Visible Red Laser Dot Color: Red Battery: LR41 Product Weight: 20g PACKAGE INCLUDED 1 x 223 Rem Bore Sight 6 x AG3/LR41 Batteries