Function: 1. Easy to use: The red dot reticle in the viewfinder features adjustable LED dot projection on a non-magnifying viewing window. The red dot is easy to find as it contrasts sharply with the color of the lens material. As a result, you can aim the main telescope quickly and easily. 2. Red Dot Brightness Adjustable: The brightness of the red dot in the star finder can be adjusted according to different environments. It is bright enough to use day or night. 3. Easy Setup: The red dot sight for telescope is very effective. The adjustment knob works well and can be used to level the viewfinder before placing it on the scope. Dialing is a piece of cake. 4. Fine alignment of the telescope: The knob allows you to adjust the red dots horizontally and vertically for fine alignment of the telescope. 5. Application: simple, inexpensive and effective red dot sighting device. Applicable to Celestron P 80EQ, SCTW 80, etc series astronomical telescope. . 5P9915A RED DOT FINDER POINTER STAR FINDERSCOPE Specification: Item Type: Star Search Scope Material: plastic Weight : approx. 125g/4.41oz Laser: Red dot laser Black colour Battery: built-in lithium battery, CR1632, capacity 120mAh (comes with built-in battery) Application: for Celestron P 80EQ, SCTW 80 series . 5P9915A RED DOT FINDER POINTER STAR FINDERSCOPE Package List: 1 x Star Finder . 5P9915A RED DOT FINDER POINTER STAR FINDERSCOPE