40 years ago, Sony's Walkman TPS - L2 put two headphone jacks on a single device to enable music sharing. Seeing this, the idea of sharing music from a portable, personal device became popular. Once music became portable, it gave birth to many industries, one of which is the audio cable splitter. It is one of those gadgets that add convenience to an already convenient experience. The idea behind it is simple. It's an accessory to headphones and music players that routes sound to two headphones simultaneously. This tiny little device has the ability to maintain the audio quality for two...