635nm red laser sight,high collimate, glass lens, industrial quality, guarantee one year Main Specifications:Available wavelength: 635nmSize: dia.24mm x len.90mmOutput power: 2mWOutput aperture: dia.6mmOperating voltage: DC 3V, one lithium batteryOperating current: less than 50mAStandard operating distance: 100 metersLaser beam axis coaxial: longitudinal axis and laser beam are aligned, the ...