Straight to the point with these red dot lasers
These are a very simple laser diode which can be powered by a 3V power source. The modules come pre-wired to allow simple connection.
Make a simple laser pointer
You can make a quick and easy laser pointer by simply connecting this laser module to a 3V battery pack or 2X AA batteries.
While the risks with lower powered red lasers are lesser than with green or blue lasers you should avoid looking directly at the laser source.