There are 2 models of active Panasonic 3D Glasses I found. The TY-EW3D3ME and the TY-ER3D4SE. The specifications are here: ER series: https://panasonic.ca/english/audiovideo/accessories/3Dglasses/3Dglasses_specs2012.asp EW series: https://panasonic.ca/english/audiovideo/accessories/3Dglasses/3Dglasses_specs.asp So from what I gather, the EW is infrared. The ER, it doesn't say. Compatibility, for the ER, it says about my desired TV (the ST 50). For the EW, it doesn't say. Kinda frustrating. So what should I get? The prices are almost the same. Thank you in advance! ::- ).