Rechargeable 3D Active Shutter Glasse For SONY TVTDG-BT500A/BT400A W800B/850A/950A condition:compatible new This model is USB charging, built-in lithium battery, non-button battery, long standby time, rechargeable power can be used for 40 hours, using MICRO charging interface, universal and smart phone charger, foldable, retractable, effect More than the original Applicable to Sony TV models: X8500A series, W850A series, KDL-70W850B, W850B series, 50W800B, W950A series, W900A, X9000B series KDL-55W950A KDL-46W950A KDL-55W900A KDL-46W900A Series