No, the Stanmore II Bluetooth isn't portable, it doesn't have a battery. But we do offer portable speakers here.
It can be paired with one other Stanmore II Bluetooth for ambient or stereo sound; they can’t be used in Multi-Groups of more than 2 speakers.
Yes, this speaker can be used with the Marshall Bluetooth app.
The Stanmore II Bluetooth has had some upgrades compared to the Stanmore Bluetooth:
The Stanmore II Bluetooth has aptX codec, but not AAC.