Compatible ViewSonic PGD-250 3D Glasses (DLP-Link) by Quantum 3D (N44) Type: 3D Glasses Color: Black Compatible Models: VS PDG-250 (N44) Power Supply: Rechargeable Battery Working Time: 40 - 50 Hrs per Charge Package Content: 1 N44 3D Glasses, 1 Micro USB Cord, 1 Soft Carrying Bag, 1 Microfiber Cleaning Cloth, 3 Nose Pieces: Small, Medium, Large Parts: 1 Year Warranty