Star Pointer collimator with brightness adjustment. Attached to the telescope tube by a standard Vixen male foot (used in higher models of Sky-Watcher, GSO and others).
Question How do I replace the battery in this finder?
Answer The battery is a tablet with the CR2032 symbol - available in most kiosks, markets and at the watchmaker's.
The plastic cover is mounted on 3 pins, so do not try to pull it out only, pry it out and pull it in the direction perpendicular to its surface. The battery is placed with the plus (the larger part of the battery case) to the plate.