Backto20s&reg; Bluetooth RF Radio Frequency 3D Active Shutter Glasses for Samsung Sony Toshiba Sharp Panasonic Sanyo and etc. 3D Active Glasses Compatible with LCD (LED) 3D TVs. Also support plasma TVs or Projectors. Compatible to 2012, 2013,2014 and 2015 3D HDTVs with bluetooth and RF(Radio Frequency). Button Battery CR2025 included. Auto shut-off. Long battery life.