<b>HOW TO USE THE BORE SIGHT?</b><br> 1.Remove the back cover (turn it counterclockwise).<br> 2.Insert 3 batteries into the back cover(+ side up).<br> 3.Close the back cover and the laser is turned on (rotate the back cover clockwise).<br> 4.Turn off the device (release the back cover and remove the battery).<br> <br> <b>SPECIFICATION</b><br> Wavelength: 635-655 nm<br> Material: Brass<br> Operation: On/off cap<br> Type: Visible Red Laser<br> Dot Color: Red<br> Battery: LR41<br> Product Weight: 35g<br> <br> PACKAGE INCLUDED<br> 1PC: 1 x 223 Rem Bore Sight<br> 1PC: 6 x AG3/LR41 Batteries<br>