Make Your Own Smartphone Speakers

Instructions:

1. Cover the toilet paper or paper towel tube in duct tape.
2. Cut a hole in the tube with scissors so that your smartphone can “sit” in it (use your smartphone to measure the size of the hole).
3. Cut a hole towards the bottom of each cup approximately the size of the tube.
4. Insert the ends of the tube into the holes you cut in the cups, then rest your smartphone in the tube. Now you have a small amplifier!