1、Easy to Use: This viewfinder range red dot sight comes with an adjustable LED dot projection onto a non magnifying viewing window. The red dot is easy to find because it contrasts sharply with the color of the lens material. As a result, you can aim the main telescope quickly and easily. 2、Adjustable Red Dot Brightness: The star finder brightness of the red dot can be adjusted according to different environments. It is bright enough to use during the day or night. 3、Easy Setup: The red dot sighting device for the telescope is very effective. The adjustment knob works well and you can use it to level the viewfinder before placing it on the telescope. Dialing in is a piece of cake. 4、Accurate Telescope Alignment: The finger wheel allows the red dots to be positioned horizontally and vertically for accurate telescope alignment. 5、Application: Simple, affordable and effective red dot aiming device. Applicable to for Celestron P series 80EQ, SCTW 80 astronomical telescope, etc. Item Type: Star Finder Scope Material: Plastic Weight: Approx. 125g/4.41oz Laser: Red dot laser Color: Black Battery: built in lithium battery, CR1632, capacity 120mAh (shipped with built in battery) Application: For Celestron P series 80EQ, SCTW 80 1 x Star Finder Scope