The 2-Pack of Panasonic Active Shutter 3D Eyewear (Medium) is a kit available exclusively from B&H. These glasses work with most Panasonic plasma HDTVs that support 3D technology, and are compliant with the full HD 3D glasses standard. Each pair of glasses charges quickly, and features a long usage time of up to 30 hours on a single charge. They have a lightweight form factor, allowing for comfortable viewing. This 2-pack of glasses provides a cost-effective way to share your 3D entertainment with a friend, or buy multiple packs so the whole family can watch together!