beFree Sound - 5.1 Channel Surround Sound Bluetooth Speaker System - Red

Can all these be connected bluetooth or do they have to be wired

Can I place speakers in different rooms and play via Bluetooth from my PC? I don't mind having the speakers powered, just wondering how good the bluetooth connection would be if I have in multiple rooms? Can I link more speakers?

Is this device compatible to a Roku TV?

how many watts does it has

How big is the subwoofer speaker ( not box dimensions)