1.Engrave customer Logo on sample with laser machine for free fee 2.Max range 2640yard in darkness 3.Low power usage Product name Laser Sight Model NO. INRE-303LS-532 Specification 1,Length: 4.72 inches (120mm)2,Weight: 4.41 ounces (125g)3,Battery Type: One CR123 Lithium4,Tube Diameter: 1 Inches(25.4mm)5,laser colour: Green6,laser wavelength:532nm7,Output Power:5mw in mainly,and 10mw,20mw,30mw, ...