A:AnswerYes. This is like any other BT speaker. You can either plug in to you Echo device, or connect via bluetooth. If you want it on all the time, just make sure it's always plugged in.
A:AnswerI bought two of this Anker SoundCore blue speaker and I tried on Samsung S8plus and it didn't work.
It will depend if your smartphone would allow you to have two bluetooth connections for audio. I couldn't have two audio bluetooth connection on my S8+.
I was able to connect both, but only one would have audio only, and I configure the second one to be for calls only.
