OPTOMA TECHNOLOGY BG-3DRFSYSTEM 3D RF-Kit with One Pair of Glasses and One Emitter (Discontinued by Manufacturer) Compatible with: HD33/HD3300/HD83/HD8300/GT750/GT750E/3D-XL 50 Hz to 240 Hz capable for 3D compatible displays today and in the future Robust rechargeable battery - Use up to 70 hours between charges and get full charge in 3.5 hours Appropriate for large venues - 150-foot operational range High contrast ratio, high uniformity and fast response time for an optimal 3D experience