Mammoth Sales Light Up El Wire Shutter Glasses (4 PC Assorted) El Wire Shutter Glasses by Mammoth Sales Our 3-mode battery pack uses 2AA batteries, giving you 8-24 hours of light per set of batteries! These glasses are sure to be a HIT at any party or event ! The battery pack can be put inside your pocket or clipped to your pants/shorts. Don't buy cheap knockoffs that use 2 watch batteries. They often only last 15 minutes before dying!