The universal 240v AC/DC power adapters can be used with a variety of different types of equipment such as radios, walkmans, keyboards, mp3 players etc. The power adapter (which transforms the 240volt AC signal into a 12v DC output) kits include a great range of interchangeable power adapters to increase connectivity. The universal power adapters can be used with equipment that is centre positive or centre negative because the power adapters can be reversed by 180 degrees to change the polarity. Powers & charges through UK mains wall socket.