Excelvan Rechargeable 3D Active Glasses Black For Panasonic viera TC-P55st30 TC-P65ST30 Delivers a true 3D experience - For watching your favorite movies in a new way. Build-in Rechargeable battery. When turn on the shutter glasses, press the button shortly, you can switch the L/R sequence Communicate with the TVs IR emitter- To create a beautiful, full HD 1080p 8D experience Up to 10 Meter motion range,(Suggested motion range 10 Meter) Contentiously working time 80 hours; Charge time 7 hours