Be aware - cheap green lasers can and often do emit dangerous amounts of invisible infared radiation.
The green wavelength emission is generally safe, however the invisible stuff can damage eyes.
Please take note of this it is not a myth.
I think MIT did an announcement of this fact.
Look here it is now:
https://www.technologyreview.com/s/420214/the-danger-of-green-laser-pointers/
So consider this little-known hazard and Merry Christmas.
I’ve got that warning on my laser. However, I think the lead that will come flying at a burglar, after he notices the laser, will be more harmful to his health.