Completely adjustable and very clear
593872
If you have never used a helmet attached mirror it takes a lot of patience to adjust to. This is a great mirror that attaches with Velcro so it can be removed to protect it during transportation. We purchased three (one for myself one for my wife and one for our grandson) they proved to be very helpful on a long bike trip.
1141414
I am enjoying the adjustability and no glare lights.  Very stream-lined and efficient.
3411807
Got this because I'm teaching myself both mildot ranging and relative ranging. PROS: This monocular is perfect, easy to have on me at all times, and optics are crystal clear. CONS: (1) As others have posted the pouch is useless, BUT a few extra bucks will get you a velcro-adjustable molle radio or mag pouch. Worth it. (2) I would feel more secure about having flip-up covers at each end. BOTTOM LINE: The important aspects of this item are excellent, and am very happy with this item.
4200175
Wow! Crystal clear, super good fit. Easily adjustable, very comfortable. Boasts a good quality, wide strap. I can easily fit my prescription glasses under it, although I really don't need to for close-up work, which this is intended for.

It occurs to me that these would be good for motorcycle, four-wheeler, and bike riding, skiing and other outdoor activities too. They look very cool and are really good quality and, as mentioned already, really comfortable. No sign of fogging up yet. If anything changes, I will report back.

So far, at under $8.00, I highly recommend these.
1623754
Very comfortable and excellent clarity, so much so that I had them on for about 15 minutes around the house and didn't really notice.

Great at keeping road debris and strong winds out of the eyes.  They did not slip at all despite bumpy roads.  Many people use racquetball-style goggles for cycling because of the head strap, but I did not once wish they had a strap.  In fact, without a strap, they are easier to take on and off without removing one's helmet.
3805246
This is the most universal and adjustable mount I have ever used. It comes with a sleeve of bolts, screws and fittings to enable the install to connect to pretty much any projector. I was about to mix and match parts to get everything centered up on mounting, etc. Next is the tilt adjustment. Again, endless adjustment. Very pleased. Looks great too.
3402985
Pretty straight forward design, nice and solid. Its adjustable in every way to adjust it perfectly
693567
Super nice, amazing clarity and wide viewing angle, steady view that won't give you a headache from objects "jumping around" in field of vision
2759464
Easy to install and adjust, Plenty of Youtube Videos for help
2497161
I love this scope.  It is crystal clear and bright.  At first I had problems seeing more of an asterisks or a double dot. I read others with the same issue and was about to return, Then, lo and behold, I turned the scope around the opposite direction and it was perfect.  I had it on backwards.  It was easy to zero and holds for what I am using it for.  It looks the same on both ends, so it was an honest mistake.
2965940
These work great!  They are clear and easy to adjust, etc.  Thanks to the other reviews, I got the QR code (really handy when calibrating my iPhone 6 apps).  It is easy to adjust.  I'm happy with it.
3288614
Easy to install and very straight forward. I'm not sure why people are having trouble with installing this.  I mounted it w/ 3 screws on a BenQ 1700 in about 20 min.  A real bargain of a deal. Built very sturdy and easy to adjust. I go back and forth between the full zoom and less zoom, and it is easy to adjust the angle to get each one at the right height.
843687
Fully adjustable, easy to put on, very secure. I would highly recommend.
3049526
I really like this thus far.  The best part of these mirrors is that they tilt slightly so you can adjust them. I've tried others which do not tilt and the angle is always off a bit.  I've adjusted the angle to fit my needs. When my wife drives, she adjusts to fit her needs.  Would highly recommend!
2062986
It took a while to learn to adjust this for using, since I'm short (4'9") and wear progressive lenses.  Initially frustrating, but soooo worth using once I figured it all out.  I would definitely recommend this product, though it may take some time to adjust it. It can definitely be adjusted for your visual and body size needs.
4892771
Easy to assemble, sturdy, adjustable, and incredibly useful!
491246
Absolutely wonderful, incredible clarity!  I wish I had them years ago.  (I ended up buying two more for my 92 year old parents who are extremely hard of hearing.) I'm deaf in one ear and I can finally hear my TV very clearly without struggling or rewinding my program numerous times, to figure out what was said, not to mention my spouses relief the TV can finally be lower than full volume.

  Yuanj-Pro was expeditiously responsive to my connectivity issues.  The earpieces are somewhat uncomfortable because they are stationary.  If the ear pieces were adjustable and swiveled it would be much more comfortable to fit in ones ear.  I discovered under the spongy earpiece that the small nub underneath in the center is directional for better hearing performance. The portion hanging under the neck with the battery is somewhat uncomfortable after a while of wearing it around the house as it weighs 2.25 lbs hanging from your ears.  I gave this five stars anyway because I can now hear my TV so loud and clear.  I highly recommend trying these headphones, you will not regret it.