Features: Easy to Use: This finder scope red1 dot sight comes with an adjustable that LED dot is project onto a non-magnifying viewing window. It's easy to find the red1 dot because it contrasts well with the color of the lens material. So you can aim main telescope quickly and easily. Adjustable red1 dot brightness: This finder brightness of the red1 dot is adjustable to different environment. It is bright enough to use during the day or night. Suitable for Most Astronomicals Telescopes: Includes bracket that fit the dovetail mounting base on many telescopes; with a long-lasting CR2032 3V battery to ensure working life. Simple to Install: Red1 dot sighting device aiming your telescope is effective. Adjustment knobs workwells, you evened up the finder with the adjustment knobs before you put it on your telescope. Designed for ease of use, our Finder Scope is a must have for astronomy enthusiasts. Its simple installation and precise alignments ensures stargazings experience. Specifications: Material:Alloy Bottom Width:Approx.29mm/1.14in Power:CR2032 3V Color:Black Up &down Adjustment Function: Supported FreeAdjustment Function: Support Strong and Weak Light Adjustment Function: Supported Package Includes: 1xFinder Scope note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.