3D Active Glasses for SONY TV Models Replace to X940C, X930C, X910C, W850C, W800C, TDG-BT500A, TDG-BT500A TDGBT500A TDG-BT400A TDGBT400A by New TV (4PCS) Through advanced Active 3D technology, immerse yourself in Full HD 1080p clarity and phenomenal 3D picture quality. Brace yourself for pure 3D excitement that feels like you're standing alongside the actors. Response Time: 5.0 msContinuously Working Hour: 20 HoursFrequency: 120 HZContrast: 750Compatible active glasses (button battery type) Only Fulfilled by Amazon with batterybattery type is Button Cell. Delivery from Hongkong without battery. The battery door have a lock key, push the key left and sametime push the battery door up, the door open easily. Note: Please pair the glasses with TV at 10cm when first time. Support Active Bluetooth 3D TV types as below: