ESSLNBOpera Glasses Binoculars for Women Adults 4X30mm Theater Glasses Compact Binoculars for Theater and Concerts Antique Binoculars with Case Removable Chain Red

Q: Can these be use at night

They don't have night vision, but you can certainly see things if you are in the dark and you are looking at something with light within the range of the glasses.

Q: what is the shortest distance you can see through these opera binoculars? would these work to see the board in a classroom?

I really doubt that they would work for that, but I wouldn't say for certain. At a distance of about thirty yards in a theater, they were useless.

Q: Does this product have long eye relief? How much?

I got these as gift for some who liked their appearance but I didn't care for them. 4X is pretty weak magnification. I'd recommend getting something like these....https://www.amazon.com/Skygenius-8x21-Lightweight-Binoculars-Watching/dp/B071Z2WHPR/ref=redir_mobile_desktop?_encoding=UTF8&aaxitk=GFe8eyxfk-H0gWPEKXETwA&hsa_cr_id=7336694800701&ref_=sb_s_sparkle_slot

ID del producto: 310161381

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ESSLNB Opera Glasses Binoculars for Women Adults 4X30mm Theater Glasses Compact Binoculars for Theater and Concerts Antique Binoculars with Case Removable Chain Red

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ESSLNBOpera Glasses Binoculars for Women Adults 4X30mm Theater Glasses Compact Binoculars for Theater and Concerts Antique Binoculars with Case Removable Chain Red