http://www.htpow.com/300mw-green-high-power-laser-pointer-waterproof-adjustable-holster-p-1038.html
• Use your laser pointer to point at any desired targets.
• Power saving, compact and reliable
• Simply press the button to activate the laser pointer and release it to deactivate
• Light weight and handy design, it is very convenient to put in bags or pockets
• Perfect for teachers, professors, doctors, managers, engineers and so on