The knife, designed by Warburtons, heats up to 41.8 degrees Celsius, powered by AA batteries in the handle - and melts the butter just enough to spread smoothly, without gouging holes in the bread.
A button on the handle activates the battery-operated heating element and a flashing LED indicates it is on. The prototype can spread a slice of bread in 30 seconds - although it's not clear when or if it will be released, or how much it will cost.
At first, I thought that this electric butter knife—which heats itself to an optimum temperature (41 degrees celsius) in under 20 seconds—was nothing more than a frivolous byproduct of first-world culture. But the more I think of my epic struggles with a cold stick of butter sometimes, the more I think I like it.