Hi ,I have been using this flashlight for the past 2months.Iam really happy with the product and would like to share my views.
When I first got this in my hand ,I was surprised how compact it was even if it contained a 5000 mah battery.Yes with the 21700 5000mah battery, this is almost twice as good as a regular 18650 flashlight in terms of runtime ,by having almost similar size.Before beginning here are some product details.
Manufacturesspecs-
Features:
-Uses a 21700 5000mAh high-rate discharge lithium battery.
-The light utilizes CREE XHP50.2 CW LED, output up to 2500 lumens.
-One-touchcontrol all functions, it is easy to operate.
- Micro-USB charging, which supports up to 2A charge.Can be used as a mobile power supply, use the USB adapter provide power to other devices, the maximum output to 2.4A; with a discharge capacity reminder.
- -Uses constant current circuit, with high battery efficiency, stable output, no flashes.
- -Anti-reverse design to prevent incorrect battery installation causes the circuit damage.-Battery power indicator.Low battery warning.-With electronic lockout feature..
- -One-piece shell, the structure is stable and reliable.
Made of aero grade aluminum alloy, premium Type III hard-anodized anti-abrasive finish. - -With flashlight self-locating function
- Dimension and weight -
Package weight: 0.2900 kg
Package size (L x W x H): 18.00 x 8.00 x 5.50 cm / 7.09 x 3.15 x 2.17 inches - Package contents-
Package Contents: 1 x LED Flashlight, 1 x 21700 5000mah li ion battery,1 x Charging Cable, 1 x Lanyard, 1 x OTG Cable, 1 x Holster, 2x Spare O-ring, 1 x USB Cover,1 x user manual,1x warranty card. 
As the earlier ,big brother the MR70, the MR50 is also a very beautiful flashlight, with its uniform body construction.The anodizing is also great and looks shiny like the MR70.
- The mr50 has a smaller xhp 50 v2, instead of the xhp 70 in the MR70.
- But both these have a similar beam pattern.And I personally like it.It has a perfect blend of throw and flood with no artifacts.Thanks to its high quality orange peel reflector, it is a smooth beam.
- The tint is towards the cooler end,and I would have liked to have a neutraloptiontoo.
- The otg chargingfeature is also provided in this model too, and it can provide charging upto 2.4A.The one thing that I miss on this flashlight from the MR70 ,is that it misses the side light .May ,be due to its compact form, it was difficult for them to implement it.But it would have been an added feature,as there is no option in this flashlight to go to the lowest mode diectly.In the MR70, I managed it by going into the side lamp, in order to avoid sudden bright light by the main light.I think ,since there is no side light, Rofis could have given a direct access to lowest brightness.Also there is, no true low mode in this flashlight, like with the previous fenix models .Iam really happy that they ,have provided good quality holser and OTG cable .
The ,threading at the tail cap is well anodized to ,provide Mechanical lockout.It also has an electronic lockout mode achivated by pressing and holding the power switch , more than 3 sec.
- Holding it for 2sec ,turns the locator feature, where the red led inside the switch blinks.This helps in locating the flashlight ,in dark.
- The tail cap knurling is very grippy.Also the tail cap spring is very sturdy for good contact.
- The provided , battery is a new type of battery size.Instesd of the traditional 18650 battery, the have provided a new sized battery, the 21700, which can pack more power.It is a 3.7v, with 18.5 wh.The battery provided is rofis branded high fischarge battery and is protected from overcharging and over discharging.
- Measured the temperature at head during turbo
- and it got as high as 65°c.
- The temperature is quickly carried out from the led to the body, due to it's unibody construction.
- To summarize
Pro's
1.Very compact flashlight
2.Beautifully designed with good knurling for perfect grip
3.Good anodization and precise laser markings
4.Switch with great feel, easy to find switch at dark
5.Firm usb dust cover
6.AR coated glass with high quality reflector.
7.Added advantage of OTG charging at around 2.4A.
8.Good quality lanyard ,which is soft and sturdy.
9.Good quality sheath .
10.Good quality usb cable and OTG cable.
11.Great heat dissipation, due to unibody construction.
12.Has Mechanical and electrical lockout feature.
13.Charging,low battery indicator provide on the switch.
Good quality, protected 21700 cell, with high discharge capability.
14.Made of high quality aluminum, light weight but sturdy.
15.Direct acess to turbo.
16.Good quality battery contact plates.
17.Great runtumes on medium modes.
18.Great water proofing.
19.great tail satnding capability.
20.Location indicator is a very useful feature during power outage. - Con's
1.No direct acess to low mode.
2.Not so useful battery percentage indicator.
3.Could have added apocket clip option considerindg its compact form.
4.Could have , implemented the side light option.
5.Still no usb type c port.
6.Fast stepdown from turbo mode.
7.No real moonlight mode.
8.No temperature dependent step down.