El Wire Rave LED Mask Light up Guy Fawkes Anonymous V for Vendetta Mask (Lt Blue) El Wire Mask: V for Vendetta, Anonymous One Size Fits Most Battery pack takes 2 AA batteries and has 3 settings: Full On, Slow Blink and Fast Blink Battery pack can clip to anywhere from the waist and up, it can easily be clipped to your belt or placed in your pants pocket Don't buy cheap knockoffs that use 2 watch batteries. They often only last 15 minutes before dying!