JZN Blue LED Light Glow Magic Wand Stick Pen Flash Torch Lightsaber Keychain Low power consumption, ultra-bright, visible over a long distance. Environmental friendly & portable Light light up when the switch is released Great for Vocal Concert, Party, Outdoor. Light Color : Blue LED Light . Fluorescent Green in color when light is off. Power by: 4 x LR41 cell button battery (included).