These clear plastic flashing balls light up and flash when they are touched and move. They are designed for cats and pets, but have been used by paranormal investigators for some times now. We them in packs of three as you want intelligent responses from them. If you ask the spirits to touch a ball and it flashed, next ask it to touch a different one you know you are talking to a spirit that is intelligent. We have used these on paranormal investigations and have had amazing responses with them, especially if trying to communicate with spirit children.