A:AnswerHi papa42,
1. To use the speaker add function, two GTK-XB60 or two GTK-XB90 systems are required.
2. The Maximum communication range of Bluetooth 10 m (33 feet - Line of sight approx.)
3. You need to plug it in to power outlet directly for power.
Reference: https://www.sony.com/electronics/support/audio-systems-gtk-series/gtk-xb60
Regards,
David
A:AnswerHi, sheen, Yes. This portable Bluetooth speaker has a built-in rechargeable battery. If you need more details, you may visit this link: https://www.sony.com/electronics/support/res/manuals/4697/d47cfba8df269571b0546ef0f060bbf3/46972271M.pdf. -Vincent
A:AnswerOurs is just the opposite... all we can hear is bass. I think there's a way from the app to adjust this, but my husband couldn't find the setting or figure it out.
A:AnswerThe lights will flash if the speaker is off and it is plugged in. The flashing lights indicate the speaker is charging. Unplug the speaker and it will stop flashing.