no aptx. i asked many aliexpress sellers. its a realtek chip, not a qualcomm one. so no aptx for sure. aac dont know.
but maybe if you have some know how of android modding, you could get SBC bitrate mode working
SBC specifications allow higher bitrate than currently used by manufacturers(mostly 384kbit max). like up to 512kbit. so even if SBC 384kbit sounds like 192kbit AAC, with 512kbit its like ~ 33% more bitrate which should be audible improvement
https://forum.xda-developers.com/android/software-hacking/improve-bluetooth-audio-quality-t3832615
and in the case of the TRN BT20: bluetooth 5.0 has now support for 1MBit/s , so maybe you could go even higher with the SBC bitrate. some people have reported that they got 617-660 kbit/s working (and that with <5.0)
yeah since android 8, you have AAC, aptx, aptx HD, LDAC bluetooth codecs included in every phone. google has made a deal that its licence free now on android. only the "receiver" device has to pay licence fee for the codecs.
and who knows, maybe the TRN BT20 has AAC. we have to wait for the reviews
and regarding battery life, thats why i want to see something like TRN BT20 but with the new Qualcomm bluetooth 5.0 SoC. they should be up to 65% more efficient. so we could have ~10h play time instead of the ~5h. sadly there is not much info about the realtek 5.0 SoC, but looking from the specs on the aliexpress pages, it does not seem to be that the realtek 5.0 is that efficient
Just got a TRN-BT20. Confirm that it has AAC.
The good things are:
- Sound, connection and battery seems quite good. It's still playing well since last charge 4 hours ago.
- Stereo mode when making/receiving a call
- One-touch operation does activate voice control
- Pairing is easy
Not so-good things:
- One-touch operation does not work well as advertised: "press twice" does not trigger "next track"; "press thrice" does not trigger "previous track"
- Right ear hook sometimes drops connection for just 1 second, then reconnects immediately
Overall, quite happy with the purchase for a cost of around 27usd.
P.S.: Mine is a 0.78mm 2-pin hooked to a Kinera H3, paired to a Blackberry Keyone Black-edition.
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