3D Active Glasses Coolux@ for Sony TV Models Replace to TDG-BT500A TDG-BT400A Android&trade; TVs (2pcs 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 batteryButton Cell. Delivery from Hongkong without battery. This is upgrade new version which easy to pair. The battery door have a lock key, push the key left and sometime push the battery door up, the door open easily.