Flashing Panda LED Light-Up Flashing Party Raver Shutter Sunglasses Shades, Lot of 4 Blue Shades These shades feature shutters across the eyes and no lenses. 3 modes: fast flash, slow flash, solid on. Battery compartment and mode switch in the bridge. 3x AG-3 button cells provide hours of run time. Requires a small Phillips screwdriver to replace batteries.