I bought these glasses for my Epson Home Cinema 2040 projector. They have a good design, are comfortable to wear and are very light, weighing only 32 grams. 3D is superb. And as other reviewers have said, the storage box that comes with the 4-pack is a really nice addition. They can be used with a 3D TV via Bluetooth, or with a projector or emitter via RF. I've searched the internet to find out how many pairs of glasses I can connect to my Epson projector and couldn't find the information anywhere. So I emailed Hi-SHOCK (via Revain) and asked if they could tell me. They could, and here is their answer. "Normally, around +50 points shouldn't be a problem. Since it's an RF signal, the quality is really good and it's easy to connect multiple devices.β Excellent! And I ordered two 4-packs. Something that isn't on the Revain website is that Hi-SHOCK is based in Germany. A couple of points on that. First, I emailed the question to Hi-SHOCK twice, both times around 10:00 PM CA. And both times when I checked my email the next morning, there was her reply. Germany 9 hours ahead worked in my favor. And secondly, as it was being shipped from Germany, the item arrived a few days later than the Revain's estimated delivery date. For me it was no problem. I wholeheartedly recommend Hi-SHOCK and this product without hesitation!
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