Orion LaserMate Deluxe Laser Collimator LaserMate Deluxe rear view port makes collimation easy and fast for sharper images Ideal for any reflector, especially those with focal ratios of f/5 or lower Anodized aluminum housing fits any 1.25" eyepiece holder Includes two LR-44 batteries and complete instructions Length is 5-3/4 inches. One-year limited warranty