Glo Germ's most powerful ultraviolet flashlight, this 21 LED light can be seen in broad daylight. For use with Glo Germ Oil, Gel, or Powder, simply twist on to reveal "unseen germs" on hands or hard surfaces. Requires 3 AAA batteries.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.