ss3e55huntPasted from description "this DAP uses two-way Bluetooth with aptX, which means it can transmit to a speaker via Bluetooth 4.0 or receive data from a smartphone to act as a Bluetooth DAC/amp unit"
DesibiduFYI, it can transmit Bluetooth AptX but not receive.
In fact I prefer my $15 Mpow BT receiver audio quality over the M2s as BT receiver.
Most people probably won't use it that way, but I was going to stream Spotify from my phone while at the gym.
I will say I haven't had the issues others, mine powers on stays on and battery dissent explode. It sound pretty good for it's price range. Only reason I don't really use it is because I like using Spotify and the only way to do that is via streaming from my phone and that's just didn't sound as good. I have a new, higher end DAP, that runs Android and works with streaming services.