The TDG-500P 3D Glasses are Rimless Passive 3D Glasses for BRAVIA Full HD 3D TV. You can use them to experience immersive 3D pictures. Simply slip on the Sony TDG -500P 3D Glasses over your day-to-day glasses and enjoy sharp 3D images from the comfort of your couch. It offers optimum comfort with an easy fit.The TDG -500P 3D Glasses weighs only about16g (including battery) and measures approx. 148 x 42 x 174mm (W x H x D), so that you can easily use, handle and carry it anytime, anywhere you want.