It’s a 589nm yellow laser pen, and the laser power is 5mW. It use a CR2 3V battery. Install the battery with the positive terminal toward the tail. This pen is very portable. Let’s check it now.
It’s a 589nm yellow laser pen, and the laser power is 5mW. It use a CR2 3V battery. Install the battery with the positive terminal toward the tail. This pen is very portable. Let’s check it now.
