Anyway i checked more carefully the enclosure:
It has one the one side a TechnoEthical sticker and on the other side :
N14939 DNUA-93F
FCC ID: NKR-VRWL25

If your sources are the proper ones (Devuan), the firmware installed should be without any issues.

Maybe you purchased a counterfit Techno N150?
Your description of the packaging would seem (?) to point in that direction.

That said, a USB wi-fi adaptor with 'N150' in the label could be one of a great many brands using that Atheros chipset in different physical formats.

eg:
https://tehnoetic.com/tehnoetic-wireles … earch=N150
https://tehnoetic.com/tet-n150hga?search=N150

You may want to contact Tehnoetic to ask if what you purchased is genuine.
ie: send photos of the hardware, the packaging and a *.txt file with the terminal printout when you run:

~$ lsusb

Best,

A.

Product name : @Tehnoetic TET-N150 . Which seems basically a simply rebranding of 2010 Taiwan or Chinese  @ Sharp VR-WL2 or @ Wistron NeWeb/ DNUA-93F . (The DNUA-93F is on the sticker but the FCC-ID corresponds to Sharp VR-WL25) .. But it seem from thils list @ that various     AR9271 based wifidongles report to linux the same Ven:Dev ID. So i wonder if all that name jungling has any meaning...

@  (2014) FSF-certification announcement

I tested : Technoethical's N150 mini wifi@
For many years i have in my home turned towards using wired networking . The reasons  being :
1) having in many years tried various adaptors that have problems making the work reliably (even if most of them claimed also linux support).
2) being afraid of the emf pollution .
Anyway i had in my radar for many years technoethical and so i decided to buy and try Techno's N150 that claims a

As for the open firmware i found:

• @ open-ath9k-htc-firmware.

• @ Announcement of the release in the @ ath9k_htc_fw emailing list.

• @ A nov/2011 datasheet of AR9271.

From little i've read it seems credit goes mainly to : Adrian Chadd and Luis R. Rodriguez (@ (2008)Atheros hires ath5k developer)
In the Announcement email they thank management of QCA and even Tensilica .
Here @ (a page orf AR9271 specs) it says:
SoC Architecture: RISC - Tensilica core (Xtensa LX2.1.0). So i guess Tensilica is the microprocessor that executes the firmware.

The T'sN150 page claims:

Well that doesnt hold in Devuan 6 's 6.12.74 kernel.

Initially plugging in various usb3 ports of my Devuan 6 PC  i didnt see any syslog messages (nothing!).
Plugging it in a usb2 port i show a $ lsusb entry :
Bus 003 Device 006: ID 0cf3:9271 Qualcomm Atheros Communications AR9271 802.11n

But after:
# apt-get install firmware-ath9k-htc firmware-atheros 
it works ok in either usb3 (blue) and usb2 (black) ports.

Also i dont know why but my adaptor came not with the fancy logo filled small sticker but with a simpler one with made in china and some small stuff that i  dont remember.

Also according to @ the product name of my dongle is  Wistron NeWeb DNUA-93F and it contains also a usb chipset: Atheros AR9002U . ( The FCC ID on the dongle matches @  Sharp VR-WL25.  .

ps:
I am very curious how that happened. I mean what conditions and efforts allowed a company to accept to license openly a product's firmware.
Also i wonder it the firmware contain blobs.