2 PACKS of 3D Bluetooth Shutter Glasses for Panasonic TC-L42ET5 TC-P42UT50 TC-P50ST50 TC-50GT50 TC-L47WT50 TC-L47DT50 TC-L47DT50 TC-P50XT50 TC-L47ET5 TC-P50UT50 TC-P55ST50 TC-P55GT50 3D TVs Black Support newest bluetooth 3D TVs of Samsung/Panasonic/LG, and Epson RF Projectors Button Battery supports 100 hours continuously working time Auto power off function, energy efficiency Detachable Arms, light design, 27g only