Does it support AAC?

I'm reasonably sure the QCC3020 chip does not support AAC, so I don't think the E10 does. I think you have to use the CSR8645 chip to add support for that.

It’s not mentioned on official description (although even SBC not mentioned) but reviews and people said it supports. And yes chip doesn’t support as you stated. So, I’m not sure.

If chip does not support, I cannot realistically see how the earphone would. You'd need to add another chipset and if so, why not just swap rather than use 2? With no official confirmation and the chip not supporting it, I'd say its a hard no.

Do you know what is the IPX rating?