EXAMINE THIS REPORT ON AND HOW DOES IT WORK?

All you need for the shutter is really a piece of heavy black paper large sufficient to include a lot of the cannister bottom. Tape a single side from the paper securely on the facet of your cannister base, so it would make a flap more than the pinhole in the middle.For those who do this at the hours of darkness, you can see pretty smaller 9-volt s