Not very happy with the purchase. Not very effective at blocking blue light from a computer, only gives the screen a very bright red cast. Very poor quality of materials and workmanship. The seller contacted me about my dissatisfaction with this product. A replacement was issued and received. The contact suggested that initially I may have received a defective pair and he/she may have been right. The replacement pair don't have that ugly red cast anymore and the quality, while not impressive, is much better than the previous ones.
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