It looks like this idea was based on the concept behind popular video game Guitar Hero, where playing a guitar was suddenly incredibly easy. And it was all thanks to the color system that told us where to place our fingers.
The idea transfers that same concept to the real world, in the form of a simple accessory called Fretx, with the shape of a thin strip of LEDs placed on the guitar neck, directly under the strings.
Then, all you need to do is connect Fretx via Bluetooth with your mobile phone and select a song. The LEDs light up following the song’s notes, and tell you where you should place your fingers for the perfect melody.