This red dot finder scope was part of the package when I bought my StarTravel 102 refractor. Its much smaller than my Telrad reflex finder and I find it much easier to use as well. It mounts directly onto the finder scope bracket, unlike the Telrad which has its own base. The advantage of the separate base is that you can use a 9x50 finder scope as well.
It features adjustable brightness control as well as two alignment screws for calibration. Quick and easy to use and once calibrated it rarely needs doing again.