This Alien body light takes the standard alien head shape and adds cool LED lights for some nighttime fun. The classic green Alien head looks great as a pin during the day, then at night, twist on the LEDs and no one will miss the Alien on your shirt, backpack, or whatever place you stick this body light. Strong magnetic backs make this body light attach to nearly anything. The Alien head measures approximately 1.25" high x .75" wide and uses 2 easily-replaceable long-lasting lithium CR927 button cell batteries (included).