The word laser is an acronym for Light Amplification by the Stimulated Emission of Radiation. The 'light' produced by a 5 in 1 Laser Pointer Green , a form of non-ionising optical radiation, has a unique combination of spatial coherence (all the waves are in phase); monochromaticity (i.e. have just one colour or a narrow bandwidth) and usually high collimation (i.e. low angular divergence such that the beam does not 'spread out' significantly with distance). This combination of characteristics distinguishes Pen Laser Pointer radiation from all other light sources.
500mw Laser Pointer Green must have a power output of at least 95 milliwatts (mW) in order to burn paper, although higher outputs will cause the paper to catch fire faster. The majority of burning lasers emit green beams, as red lasers by default have too wide of a beam to catch paper on fire without additional focusing.
Although High power green laser pointers are a great tool for astronomers, the beam can be very dangerous if the laser is not used properly. NEVER point lasers at aircraft or even use lasers when aircraft are in the sky. Keep the laser turn off when it is not being used to point at celestial objects. Do not let children play with lasers.