If you're looking for a good all round inspection camera this is it....
I purchased this with specific task in mind:
1. Plumbing inspection and leak detection especially when the drain is clogged...
2. Automotive and light duty Truck repair - used it to do visual inspection inside cylinders on diesel engine valve, cylinder walls and piston.. I used it to locate hidden bolts while changing out cam driven distributor on 1994 Toyota Camry..
3. Home HVAC inspection on evaporator, condenser, and supply side air registers.

I am retired and no I am not a professional.. just like fixing things and the K&F Concept Inspection Camera is soooo much better than using an inspection mirror and a flash light....plus you don't have to climb over or under things to do inspections....My wife uses it to find things that she has dropped behind the washing machine, dryer or the stove...

I have owned the K&F Concept Dual for more than 4 months now and would like to briefly share my experience.
First of all, I am still convinced of the dashcam! Overall, it delivers a good image, even very good images during the day, although it must of course be said that this model also does not have autofocus and therefore does not focus infinitely. Unfortunately, you can no longer read license plates or signs at night, but almost all dash cams in this price range have this problem. If an accident occurs, the video can also be used to reconstruct the accident at night.
I only use the front camera. It's a shame that you can use both cameras at the same time, but only in Full HD mode. For example, if you want to operate the front camera at 60 FPS, you inevitably have to leave the rear camera switched off. The processor is probably unable to process the data. If you set a resolution higher than Full HD, I personally don't see any advantage in the image.

The motion mode works very well. I've had to brake hard several times and the camera reliably saved the current video. If you want, you can save the video yourself at the touch of a button.

This high resolution 1920P HD probe is a very useful tool in any situation where hard to reach areas need to be checked. It is IP67 waterproof, can be used underwater for 1 hour and the depth can reach up to 1m. Useful for vehicle repairs, pipe inspection/maintenance, ventilation duct inspection, etc.

I've been thrilled with this video camera! The Ultra HD 4K resolution and 48.0 Mega Pixels make for stunning, vibrant footage. The 18X Digital Zoom and touch screen are user-friendly. The long-lasting 1500mAh batteries, which allow recording while charging, and the support for up to 256GB SD cards ensure no interruptions. The pause and time-lapse functions, coupled with night vision, offer great versatility. For its price point, the feature-packed camera is a steal and highly recommended!

Quality best inspection camera I ever own.

Fantastic camera!!
I loved how easy this was to set up, no big cables making everything very easy to manage.
it works perfectly, i put a 32gb micro sd card in it a week ago and it still records every time a person walks by my house, pretty sure it will record the whole month of november and december , maybe more?
Love the fact that there is a speaker on it so not only does it pick up sound but it also provides an option to speak through it if I need to speak to a delivery driver or postman I can.
The ability to move it fantastic, I can look up and down the street no problem!
I've even observed my cats with it.
The app is very easy to use, I would leave the notifications off if you live with a lot of people on a busy street as you will get a notification every time someone walks by, but it shows how well it recognizes people. The app also lets you reduce detection sensitivity, which is great if you wanted to keep notifications on.
It's been charging all week and not losing any battery life despite the weather being pretty terrible, not much sun either but it still held up.
Live mode is viewable in SD and HD, but I keep it in HD all the time. It will record in HD no matter what.
I'm sure you can have multiple devices on the app which is perfect if you want 3 or 4 of these around the house when they can pick up the internet very well.
All in all this is a great product, easy to use works great and the price is great too!
It looks good too!

Definitely highly recommended

Excellent product, all praise. Can recommend to anyone looking for a good camera. Excellent picture, HD resolution and more. I do not have the slightest complaint

It is a solid, sturdy, yet light weight camera producing a very good HD detailed picture.