The Levitating Portable Speaker (or PJ9) is a wireless, 360-degree omnidirectional speaker that flies above its station. It has a built in sub-woofer which means that it should not sound too tinny. When its 10-hour battery is low, it automatically descends down to its station and charges wirelessly, without interrupting music playback.
It’s also weatherproof (up to IPX7 specifications), and can connect to two Bluetooth devices simultaneously.
So does this mean that the audiophile friend of mine who set his speakers in concrete to stop them moving and improve the sound quality was completely wrong? Probably not. There are lots of speakers out there which defy the rules of sound quality in the interests of being a gimmick. Their makers always say smaller speakers sound better thanks to modern technology and they never do.
Still it looks very pretty.