The human eye is a fantastic optical instrument capable of concentrating light a 100,000 times onto the retina," explains Joshua Hadler, physicist and laser safety officer for the National Institute of Standards and Technology Laser Radiometry Project.When we unscrew the attachment (which is as easy as a child's job), it gives a powerful single beam of green laser pointer which can be used for pointing in presentations etc. I personally used it for pointing it to stars and moon and the laser beam is so powerful it feels that you are actually pointing to them.