This is the first laser that I bought, the refresh rate of the beam is good enough (no flicker like sense of others), the power is correct for small evening (it was a student party on still small, but it was rather act as scenery). The laser (box) is very small . it to a mode of writing but can not ask him to write what you want.
15MW ... other lasers can be a bit more powerful for the "same" price.
Has no shutter
The sound effect is a fast (one quick way to pass the false ceiling effect)
Rather good investment for the price and good quality (no problem of fluctuating beam etc ...