So, ideally the AC adapter will recharge both speakers at the same time or is there only one lead supplied ?

I wonder if they're able to do this directly with the original transmission from the host device, or if one speaker has to receive both channels and the send one to the other speaker? If that secondary transmission is analog, it's susceptible to noise, and if it's also digital, it introduces additional delay.

Personally, I'll be impressed when I can get a bluetooth speaker and mic in separate hardware, and pair them to a phone to work as a single handsfree unit. (Retro candlestick phone, here I come!)