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I own several of these Optoma ZF2100 3D glasses, which I use with an Optoma 25e 3D projector, BC100 RF emitter and a Sony 3D bluray player. These glasses work easily. They sync fast and stay synced over long distances and between rooms. The built-in rechargeable batteries hold a charge for a long time and are easy to recharge with the included USB cord. According to my research, these glasses are not compatible with the BC300 type RF emitters now being sold for use with Optoma projectors. The only other glasses I use with my Optoma projector are called 3D Now glasses I bought back in 2014 from a Canadian company. The 3D Now glasses are very similar to the ZF2100 glasses, but the batteries seem to hold their charge a little longer. These ZF2100 glasses are hard to find, but with a lot of searching and shopping I have managed to find a couple of pairs in the $33 to $34 range in the past couple of years. I think that represents a pretty good value for 3D glasses using Bit Cauldron RF technology.Read full review
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