This focused ultraviolet flashlight fits in the palm of your hand for quick and easy inspection of hands and surfaces. For use with Glo Germ Oil, Gel, or Powder, simply twist on to reveal "unseen germs". Requires 1 AA battery.Glo Germ is a fun, safe teaching tool used to illustrate how easily germs are transferred from surface to individuals and vice-versa. An ultraviolet light is used to show the multitude of places germs are collected and spread. Utilized as a teaching aid, Glo Germ illustrates the importance of washing hands and surfaces to prevent the spread of germs.