Mercury 4 gang 13a trailing socket with neon indicator black mercury 429 651uk these days you need more and more sockets for all those products and devices this trailing socket is just what you need for distributing power to all those devices including pcs printers electric fires and kettles the socket includes a neon indicator so you know when it is on the extension socket is completely wireable allowing you to easily add your own cable to the length you require rather than the short