Here’s a first: a nifty alarm clock hack that “gets its power from a couple of 140-decibel electric horns.” In addition to the horns, you’ll need soldering supplies to build your own. Video after the break.

A relay, a 12-volt laptop power supply and a whiff of solder later, and this cheap alarm clock was transformed into the most ear-shattering alarm clock you’ll ever hear.

[via TechnabobKipkay]