Awesome throw, low charge warning via vibration, wireless (!) remote button, two capacious 21700 batteries, and an unusual LED. All this is update of Nitecore previous long-throw flagship MH40GTR. Let`s take a closer look if Nitecore succeeded with this update or not.
Specifications:
Maximum brightness 1500lum
Maximum throw 1500m (570000cd)
LED Luminengin G9
Power supply: 2 × 21700, 4 × CR123
Dimensions: length 256mm head diameter 65mm
Weight: 246g
PACKAGE AND APPEARANCE
Nitecore MH40S is current flagship model of MH line. So, package is at the same high level as the price. Looks really good to pick for a gift.
Inside, in the cradle of foam rubber, there is a generous set of everything you need: the flashlight itself with a pair of 21700 5000mah batteries, a holster, a lanyard, a charging wall unit and a Type-C cable for it, an remote button with mounts, a manual
The holster is excellent
And here is something unusual - the wireless button. There are no batteries, it seems that button is powered by a piezoelectric element. You can fasten it with Velcro ties, a Velcro sticker, a pair of mounts for the Piccatinny rail. 
And here is the flashlight itself. The design is pleasant, it is clear that this is a brand item. But Nitecore MH40S lacks its own distinctive features. It is just a workhorse. 
The previous version, Nitecore MH40GTR ( the longer one ), had his own face, it was difficult to confuse the flashlight with some other. By the way, it`s head diameter was 4mm wider then MH40S 
With such dimensions and light distribution, this is a flashlight for very specific needs of light. Much more compact and less long-range flashlights are enough for the vast majority of people. Anyway, it is good to have a choice for any need.
Nitecore MH40S is controlled by the same pair of tail and head buttons.
Tail button has soft and deep move. The spring is double and thick
A spring-loaded contact pad is installed in flashlight head.
Machining, of course, is flawless.
The flashlight is powered by two capacious non-proprieatry, usual 21700 batteries.Good.
The knurling is tenacious, the weight distribution is good, the grip is comfortable.
The head itself is relatively large, but is common for such sort of flashlights.
Cooling fins are nothing but decorations. I’m sure Nitecore HM40H should handle heat with only amount of metal in the body. BTW, I have seen much larger heads, up to this monster 
so large head or not large - this is only relation…
Button has indicator backlight, is convenient and easy to find blindly.
There is one more indicator, besided backlit button. The flashlight also vibrates when battery level is low, this is much more convenient than LED blinking.
There is a thick and reliable plug for Type-C charging connector on the opposite side of the button .
And this is wonderful, as MH49GR had a pin charging, you couldn`t charge flashlight anywhere as you can now.
Charging is fast, 2 hours for a pair of 21700 is a wonderful indicator. The bezel teeth are shallow and wide.
The reflector is deep and smooth. 
XPL-HI used in previous model is good, but still far from the most long-range LED. Now the standards of exceptional penetrating power are set by Osram LEDs, but Nitecore never afraid to experiment and they chose Luminengin G9 LED, which is totally unknown to me. Well, well … let’s see what it will result in
UI
UI of MH40GTR was…mmm…how it say softly…specific.
Luckily, Nitecore used somehting well known this time. UI of MH40S is as simple as possible, with all the PROs and CONs of this.
I`d prefer something more flexible, but i suspect that this straitforward UI is quite good exactly in case of specific use of MH40S
OFF-ON - click tail button
Switching brightness levels - click side button
Instant access to Turbo only through mode memory
Instant Strobe - hold side button.
Hm, i`d set Turbo here, dont see any need of Strobe here. \
How the Nitecore MH40S illuinates
The flashlight has fully stabilized brightness, which is good.
Brightness drops with no cooling, and with such a size of flashlight body, this means that the thermal cutoff threshold is set too low. A flashlight with such an abundance of metal in the body and powerful batteries should easily sustain 100% of the turbo.
This is flashlight for oudoor use, so it is clear that there will be some kind of wind in most cases. And here you will have an hour and a quarter of crazy, crazy throw. High is stabilized as it should be, there are nothing to complain about 
And here is the light itself. In terms of range, Luminengin showed its best side, it fit modern standarts of throw, which are way higher when they were in time of MH40GTR. But what is it? The light at low brightness is very green. I mean very.
Well, light is not clear white even in turbo. Nevertheless, I must admit, that you will likely not notice this green tint when use this flashlight somewhere in forest. Moreover, an average user will notice green tint at all. Average user just has no idea of color temerature and tints. But still the fact of such green tint is not pleasing.
I have no idea why Nitecore didn’t choose some Osram LED. What about the rest, I repeat, the range is excellent. 570kCd is a very serious figure (it is candelas, not lumens, that allows you to evaluate the range). Here green tint doesnt affect throw at all.
City lights doesnt let you see that even at minimum brightness, the flashlight breaks through a couple of hundred meters a little bit. This would be perfectly visible in some pitch darkness.
650m is already a distance where there only Turbo mode can be usefull. At least as in city, with all it`s light pollution. I admit that High mode can be good here in dark some outdoor situation. 
Nitecore promise that the MH40S will reach up to 1.5km. Big, big figure. The building is almost at this distance and it looks like a flashlight can highlight something there.
i`ll add video review soon, but i believe that all these pics and GIFs are clearly illustrate potential of Nitecore MH40S
OVERALL IMPRESSIONS
Nitecore MH40S is definitely a very big step up from the MH40GTR. The range of the flashlight is half more, and meets today’s crazy standards. The same about a dramatically increased battery capacity, and hence the runtime. And the batteries themselves are usual ones, not expensive proprietary. Flashlight uses standart and fast Type-C charge port, UI no longer makes you want to take a flashlight and smash the head of the one who came up with such an experimental UI of MH04GTR. Of course, UI is not flexible, you will not get instant access to the turbo and low, but this is exatly that the average looks for.
And, well…turbo always lies a maximum of 3 clicks from any mode. The kit includes a wireless remote button, the wires will not interfere use. The flashlight vibratate with battery level is low. In short, a lot of imrovements were done to make Nitecore MH40S meet modern standarts of throw and runtime. The manufacturer almost does not experiment here, they just created a long-range flashlight with classic UI and modern battery with fast charging.
But it is precisely this “almost” that is the only drawback - the light of the Luminengin G9 is seriously littered with a green tint. It may not be visible. when using a flashlight among the foliage. But you will see this immediately in other conditions. Yes, it does not affect the range, but it certainly doesn`t please my eye as well. And here you have to determine by yourself how heavy this green tint will be on the scales of “For” and “Against”. I hope that my review will help you with this decision.