The PGD-150 Active Stereographic 3D shutter glasses open new worlds of immersive learning possibilities. Molded in rugged plastic, these durable glasses also feature water and dust proof design. Designed for heavy classroom usage and easy cleaning. Long lasting lithium batteries provide for up to 70 hours of power before replacement. The three different sizes of custom interchangeable nose pieces guarantee a comfortable fit for each user. Make reality one step closer with the PGD-150 3D glasses.