Hot topics

Huami Amazfit T-Rex review: the affordable military smartwatch

AndroidPIT Amazifit T Rex front
© nextpit

Read in other languages:

The T-Rex outdoor smartwatch first launched back at the Consumer Electronics Show (CES 2020) in Las Vegas, and becomes the 7th series of Amazfit smartwatch. The growing brand - Huami is most famous for making the Mi Band fitness trackers - has built this one for extreme conditions and challenging terrains such as deserts, mountains, or freezing conditions. The battery life claims are bold, and the price attractive, so I decided to check it out.

Amazfit T-Rex


  • MIL-STD-810G certified
  • Affordable price
  • Long battery life


  • Chunky
  • Cheap-feeling strap
  • Not available globally
Amazfit T-Rex: All deals

Amazfit T-Rex release date and price

The Amazfit T-Rex comes with a recommended retail price of $139.99. For the outdoor market this is targeting, that is considered very affordable. Given the military certifications for durability, Huami is continuing to undercut the competition on price.

The durable smartwatch is available in Camo Green, Army Green, Khaki, Rock Black, Gun Gray. I tested the Rock Black version.

Big, bold, and unashamedly robust

The Amazfit T-Rex has a rugged and bold shape. The body itself is made of a high-durability polymer material. There are also large metal buttons for ease of control when outdoors and a raised bezel and protective bumpers. The polymer material doesn't feel high-end or luxurious in any way, but that's not the point here. The T-Rex smartwatch, unlike its prehistoric namesake, is a lot lighter than it looks though. Without the strap, the wearable device comes in at 39 grams. It's a pleasant surprise when you consider how big and bulky it is.

AndroidPIT Amazifit T Rex front wrist
Significant bulk, but still lightweight and comfortable. / © NextPit

The sturdy watch is held onto your wrist with sweat-absorbent and silicone straps. Whilst it is comfortable to wear, the straps do feel a little cheap. There is also no quick-release mechanism for changing out the straps to something more to your tastes.

The big selling point of the Amazfit T-Rex though is its proven durability. The Huami smartwatch has won 12 military certifications , including the sought-after U.S. Military Standard 810G (MIL-STD-810G) certification. It is also water-resistant up to 5ATM, can survive extreme temperatures between 70°C and -40 °C, and up to 240 hours of damp-heat or 96 hours of salt spray. Naturally, I have not been hanging out in Alaska, diving to the depths of the ocean or trekking through the Sahara desert to put these durability features to the test, but the certifications are there so I don't have to.

AndroidPIT Amazifit T Rex side
The buttons are made of metal and feel very sturdy. / © NextPit

A bright OLED display

The 1.3-inch OLED display bright enough for outdoor use and the T-Rex was highly visible  during my testing in what was a pretty sunny spell in Berlin. The screen is covered by Corning Gorilla 3 and has an anti-fingerprint coating. The resolution is 360x360 pixels and the manufacturer says it is capable of displaying 16.7 million colors. There is an always-on-display feature that allows you to permanently display the time, but it will impact battery life.

AndroidPIT Amazifit T Rex front closeup
An always-on-display feature allows you to permanently show the time. / © NextPit

Overall, the display is nothing to either rave or complain about. It's perfectly suitable for this price point and the main thing you want from a display on a smartwatch that is going to be used outdoors a lot is brightness, and the Amazfit T-Rex ticks that box. Once again, Huami has focused on the thing that matters most, and cut the rest.

A great fitness tracking app runs the show

The Huami smartwatch uses the well-known Amazfit app for pairing and customizations, as well firmware updates and things like downloading new watch faces. There are up to 14 sports modes are available on the T-Rex , covering outdoor running, walking, cycling, treadmill, climbing, trail running, pool swimming, and many more. Switching modes takes just a few clicks, and the buttons really help out here. Compared to the Amazfit GTS, which I use regularly as a running watch, navigation through the OS is quicker when you are on the move thanks to the three additional buttons on the T-Rex.

Huami's self-developed PPG Bio-tracking is one of the key selling points this year. The T-Rex is equipped with the optical sensor, and it runs 24-hour heart rate monitoring. It can remind you when you need to replenish yourself with water or tell you that a light work-out will encourage you to develop healthy habits.

AndroidPIT Amazifit T Rex front hand
The four external buttons are good for navigation. / © NextPit

Other features include an advanced activity tracker showing distance, active hours, calories, and steps you achieve, along with sleep monitoring - although nobody is going to sleep with this thing on their wrist, surely!?

Navigation is possible with both GPS and GLONASS, and I found it solid during my testing. One minor frustration I have with the GTS, however, has also carried over to the T-Rex. The smartwatch updates its A-GPS system when it connects to your smartwatch, and the process can take several minutes to complete. It only kicks in when you open the app, and the updates are frequent, so you'll often find yourself waiting to start your exercise until everything has been optimized.

Up to 20 days of battery life

Battery life is one of the biggest positives I look away from my time with the Amazfit T-Rex. The brand tells me that battery lasts up to 20 days, and even with  GPS activated permanently is can run continuously for up to 20 hours. The 390 mAh battery is not exceptionally huge for a smartwatch, but this thing runs and runs. I started my 7-days of testing with a full charge and ended with 28 percent battery left. This is whilst putting it through a review process where I am testing out features and probably pushing it a little harder than what I would call regular daily use. From what I can tell, however, those battery life claims will stand up.

AndroidPIT Amazifit T Rex back
Charging is done via a magnetic dock that clips to the back of the watch. / © NextPit

The story is the same on previous smartwatches I have tested from Huami, and the reason is the brand's own operating system. It makes you realize just how much power-thirsty WearOS is. Sure, there are advantages to Google's smartwatch OS, but battery life is certainly not one of them, and it's only when you branch out to smaller brands that you realize what is possible with properly optimized software.

Final verdict

The Huami Amazfit T-Rex is not for everyone, and I would not recommend this for a daily smartwatch or fitness tracker, despite the fact that is has a lot of features for these use cases such as sleep tracking and indoor sports exercises. If you are looking for something affordable and durable to take out on longer adventures in the wilderness, though, the T-Rex should certainly be on your radar.

The GPS accuracy and long battery life make it a great option for long hikes in the great outdoors, and you can't write off those military certifications as simple marketing spin. I stopped short of throwing this thing off of a roof, but remain confident that it will stand the test of time and anything you can throw at it whilst exploring the countryside.

 The best gaming monitors at a glance

  Best gaming monitor up to $400 Best gaming monitor up to $600 Best gaming monitor up to $800 Best gaming monitor up to $1,000 Best gaming monitor for consoles
Image LG Ultragear 27GP850P - product image Asus ROG Strix XG27AQ - product image BenQ MOBIUZ EX3210U - product image Asus ROG Swift PG27AQDM - product image Gigabyte M32U - product image
Go to comment (0)
David McCourt

David McCourt

David enjoys staying abreast of the latest technology and newest Android apps. Outside of the office, he can be found playing snooker and writing bad 00s indie songs.

View all articles
Liked this article? Share now!
Recommended articles
Latest articles
Push notification Next article
No comments
Write new comment:
All changes will be saved. No drafts are saved when editing
Write new comment:
All changes will be saved. No drafts are saved when editing