Check out this cool concept for from designer Lee Young Don.

geeky concepts - saverclip

The Saverclip is a gadget shaped like a tie pin that reads electric usage on any power cable it’s clipped onto.

geeky concepts - saverclip

The device works by reading the electromagnetic fields emitted by said devices. Conversely, this is also how it recharges itself. The embedded LCD displays information in laymen terms so you clearly understand just how much power you’re using, wasting, and could be saving.

This is a cool looking concept, which monitors how much power your devices use, it would be nice to see some sort of energy saving function incorporated into the design.

via Yanko Design