Sony TDG-BR750 Slide on these lightweight, frameless Sony 3D active glassesyour 3D movies, games and shows will pop in Full HD 1080p while you relax in pure comfort. Weighing in at a mere 1.2 ounces, these glasses feature feather-light titanium arms and adjustable ear pieces for a customized fit for all head sizes, even children. Finely-tuned front-to-rear weight distribution ensures comfortable, balanced wear, even during movie marathons and gaming sessions. If you're in a hurry to start watching, a quick five-minute charge via USB is all it takes for up to three hours of viewing pleasure. Or charge them for a full 40 minutes for up to 15 hours of battery life.