Yes, we have all types of power supply for different country.  The device will ship with the power supply according to the country of our customer. If you have special request, you can leave a note about what type of plug you need when placing order.

It is possible if you connect A50 to the audio input of the four zone speaker selector and use the selector to choose which room you want to play music. But if you want to play same or different music in different room at the same time, you will need one device for each room.

Yes, it is possible. We recommand 8~10 devices max if you want to play music in sync in all rooms. If you do not play in sync, you can have more devices in your network. The number of devices is not limited, but it depends on your network speed and bandwidth to play music smoothly.

You can directly playback the music from the portable hard drive connected to the USB port. You can also stream wirelessly form your PC via itunes or UPnP software like foobar2000 or from NAS.

All our models can group together as multiroom and play muisc in sync.