The V4 High Performance Red Tactical Laser Sight and Flashlight Combo is designed and built for standard and sub-compact pistols with integrated railing systems. The FireFly V4 is a Class IIIa visible laser with windage and elevation adjustments with 400 lumen light. The laser has excellent low temperature working performance. Rail grip clamp system securely attaches/detaches quickly and safely with no tools. Use just the red laser, just the light or both.