These custom engineered LCD shutter 3D glasses have built-in electronics that allow for viewing on your Sony 3D ready TV.Enjoy 3D content without compromise to picture quality with these 3D active shutter glasses and your BRAVIA 3D TV. Designed to deliver an optimal 3D viewing experience featuring a battery life of up to 235 hours. These Sony compatible 3D glasses are rechargeable, no need to purchase batteries, and include a free USB charging kit.