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.