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The birds will be frightened and not to come back. Our lasers are using in many countries for farmers protecting their lands and scientists working in forests. Spartan 637nm 90mW Red Laser Pointer Control birds from 100m to 1km. This laser has a very bright red beam and very low divergence. The beam is still concentrated and bright enough to scare birds from long distance. Spartan 532nm 100mW to 300mW Green Laser Pointer control birds from 100m to 1km.
IMHO, there is no absolutely no reason ordinary people should own a laser pen this powerful. First of all it's miliWatt, mW. Secondly, that's optical power, not electrical power. at 200mW optical power, the reflection off a shiny surface has the potential to blind you, and so does staring into the beam. If the wall plug efficiency of the laser is 6%, that means that the electrical power draw is 3.33W.