This sighter is designed according to the online game's ball-hitting logic. After capturing the center position of the target ball on the table, an aiming extension line will be displayed, and it can also show the trajectory of the cue ball aiming at the third ball; the number of reflections of the aiming extension line can be adjusted. (This feature is similar to the single-player training room set up on some billiards websites.) Using this sighter can help you quickly become familiar with and master the skills of online billiards in actual combat, improving your visual estimation ability. Even without this software, you can still be an expert in online billiards.