Optoma 3D glasses are of excellent qualitée indeed many strengths already reasonable prices for quality glasses, that they offer the advantage is that it can be placed anywhere in the room and we see the as sharp image. They recharge, t take long hours and the load can thus connect several movies without annoy for unloading, again in case they have foreseen everything we can watch a movie while charging the ... They are light to wear, you can not feel them.