Technics does not go into detail about the wireless chipset, only that it relies on Bluetooth 5.0 connectivity. Regardless, I had no issues pairing it with my phone on Bluetooth 5.0, my laptop on Bluetooth 5.1, and my PC with the Intel AX210 NIC on Bluetooth 5.2 backwards compatibility. Pairing is quite simple since it shows up as a new device of the same name, or the full model name as seen above. It is also here that we see codec support isn't a strong suite, with AAC being the best option on most Android devices, other than the basic SBC codec. On iOS, we just have the AAC codec to go on.
There is a first-party mobile app, Technics Audio Connect, on both Android and iOS. It doesn't have the greatest reviews, but is rated higher than your average TWS app, so take that for what you will. Most complaints seem to talk about connectivity drops, which I never faced during testing, so I can't speak about that either. With the earphones paired to your phone, the app immediately recognizes them. In my case, it alerted me to an available firmware update I went through right away. This process took a couple of minutes and then walked me through the basic setup of the device, including changing the display name, setting up a voice assistant since there is native Amazon Alexa support for those who want it, and a brief tutorial of how to insert them in your ears, replace ear tips, and the various sections of the app itself. This already makes it the most user-friendly TWS app I have used to date, but the bar is set low!
The home page has a render of both earphones with the associated battery level shown below, which also acts as a quick status indicator for various operations and allows for other functions in a jiffy, including the ability to find your set of earphones with location tracking if enabled, and there is an online manual. There are three operating modes of ambient sound control—noise cancelling, off, and ambient mode. These have different, easily distinguishable symbols and sliders on a scale of 0-100 for the two active modes, once again making for one of the better implementations out there. The sound enhancement tab is effectively a 5-band equalizer with two presets and a custom option. It's limited to 10 kHz and only goes through five steps (-6/-3/0-+3/+6 dB) for the five bands, which is better than nothing.
The settings tab is feature-rich as well, beginning with the ability to change the language for the voice prompt feature of the Technics AZ70. Some of the others, including changing the display name, adding headphones, and finding headphones, made an appearance already, but some of the other options will interest many, including the ability to turn off the onboard LEDs if they annoy you in pairing mode and save battery life. There is also the ability to choose between prioritizing sound quality or connection strength, which effectively goes from the AAC codec in the former to SBC in the latter. The touch sensor customization is handy since there are many to choose from, with combinations of the same for multiple functions. This is configurable on a general use case as well as if a phone call comes up, and we can choose which of the three operating modes to toggle between. I am left impressed with this very well-rounded set of mobile app features.