The L8 is packaged with the FiiO E12, and designed to link the music player's headphone socket to the portable amp's line in. The length and flexibility allows the player and amp to be piggy-backed together with elastic bands and put in a pocket. Unfortunately, if your music player is a mobile phone (mine is a Samsung Galaxy W), in anything other than flight mode, the cable does nothing to protect you from EM interference, audible loud enough to interrupt your listening. You will get 'dee-dah-dah-dee-dee-dee-dee-deet' added to your music every time...