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 Best choice for teachers, professors, doctors, Presentation, Tutorial, and Office Meeting and so on. Clearly visible in the dark. Specification: Color: Green, Red, Blue Power: 2 x AAA Batteries (NOT INCLUDED) Packing content: 1 x laser pointer