Bright 3mm LED's Effects Controller for Flicker, Blinking, Fading, Strobe included 9v battery connector included Optional 12v Plug in cord 3mm LED eyes perfect to add glowing eyes to any prop. 9 volt battery operated or optional plug in. Approximately 24" from led to battery clip. Perfect for all installations. Long enough to wrap around your head for adding eyes to masks. Very Bright and will last for over 10 hours on one 9 volt battery. These are interchangeable with our included light Effects Controller for blinking, strobe, fading, flickering and on/off switch. Can be used for many different effects. Can also be used with optional plug in cord. These can also be inserted into the back of our Premium acrylic eyes or Eyeball Poppers for lighted eyes. An awesome all in one package for prop lighting