There are a few different Laser Systems right now. And they may work differently.
The typical Laser Training System (that I've been using and loved it) includes these parts:
- laser beam source (SIRT pistol, or laser cartridge). In you case - 9mm laser cartridge will work the best
- camera (PC webcam, tablet, smartphone)
- software / app
Such system simulates Range, drills or live scenarios.
Examples of the system:
- LASR App
- iTarget
- LaserHIT
- IDryFire
- Strikeman
Mantis works different way. It analyzes your muzzle movement. It's addition to either dry fire of live fire practice.
I personally use LASR App and I'm happy with it.