Not great, but good enough at the price of admission - Carson OPMOD DNV 1.0 Limited Edition Digital 1x10mm Night Vision Pocket Monocular

As far as I can determine, the *only* difference between regular vs. the OPMOD variant is that the standard ["Carson NV200 MiniAura"] comes with a velveteen soft-pouch [depicted in the product description] whereas the OPMOD has a nylon holster-type belt pouch w/ velcro closure [so you can be certain to scare off any wildlife who hears you whipping out your digital night vision gadget! X-D] That, and this OPMOD version is in a nice, dark anthracite grey color, to make it harder to find if you should set it down in the dark for some obscure reason [like you need your hands free?]

Pros: this is the smallest, lightest, least expensive NVD out there. It comes with an attached IR illuminator [this is important, because other Gen1 analog devices in this $-range do not, and none of them work w/o an external illumination source!] And being digital, this thing should NOT chew up batteries & spit them out the way the analog Gen1 NVD units do [altho' I haven't had mine long enough to test this theory, but I feel confident the efficiency is MUCH higher than analog units...] NB: it IS going to use batteries quickly, simply because you MUST use the IR to get anything useful out of it, so that burns up more juice vs. mere passive detection...

Cons: The built-in IR light gives off a bright red [bullseye shaped, funnily enough! It's almost like they're acknowledging that using this makes you a target for anyone who's also using a NVD...] glow visible to any creature that can see that color. The brightness on the internal B&W display isn't controllable, & it is set WAY TOO BRIGHT, so you'll probably need to wear dark glasses to use this any length of time w/o eye fatigue [& you'll be completely night-blind in that eye for some time after use until your eye can regain dark-adaptation...]

Bottom Line: This unit works far better than any of the Gen1 NVDs close to it in price, and is small enough to be pocketable and light enough that nobody can justify leaving it behind for its heft. You can roll your own by looking up the DIY videos on YouTube on how to adapt an old VHS or Mini-8 video cam into a NVD, but that will end up costing you at least 1/2 what this does, be much bigger & clunky: in this, the folks at Carson stripped out all the excess hardware and just left you with the bare bones of the viewfinder circuit from one of those old videocams, & you know what? It works pretty good! Without the IR lamp, it actually reveals less than a dark-adapted Eyeball, Mark1 Mod0, but *with* the IR, it's a whole 'nother ball game! Night vision devices are truly the key to unlocking a doorway into another world, the realm of night in which we humans are lacking the natural ability to function well [those glowing eyes of critters at night? They've got a built-in mirror on the backs of their eyeballs, to double the chances for the rods in their retina to catch the limited light available. We don't, so we get to stumble around in the dark while the raccoons, foxes, etc laugh at us! ;-) ]
As a sub-$100 entry-level device, I have to say this gadget is pretty much a no-brainer. That said, if you are willing to spend a *little* bit more, I'd check out this gadget Optics Planet carries, simply because it includes more power levels for the IR emitter and has a built-in camera:
https://www.opticsplanet.com/uzi-digital-night-vision-monocular-8gb-sd.html
or
https://www.opticsplanet.com/barska-nvx100-3x-digital-night-vision-monocular.html
[same gadget, different brand names printed on the box.]