green red blue laser pointer pen powerful beam light lamp presentation 532nm lazer high power

features: simply push the button then you can see the striking green beam of light shoot forth it will be used to point at any desired targets on projection screens, video monitors, and presentation graphics also can be used for forensics, illumination, indicating, alignment, sky pointing (astronomy) or just being cool output type: fixed focus, continuous output and working time of over 5,000 hours choice for teachers, professors, doctors, presentation, tutorial, and office meeting and