Description :Material: High Quality BrassLaser Wavelength: 635-655nmLED Type: Visible Red LaserSighting Range: 10-80 yardsDot Size: 1.5" @ 100 ydsLaser Beam: <5 mWLength: 2.16" (55mm)Battery Life When Continuous On: 1 1/2 to 2 Hours(Battery included)Package included:1 pcs 303BR Bore Sighter4 pcs LR41 batteryNOTE:As the effect varies from monitor to monitor， there is irrevocable slightly difference in colors between the color showed on your monitor and the real one， So if dear you can not accept this very little difference， be cautious before you making the orders.thanks for understanding.