This small module allows you to use the line output of the iPod dock to connect it to an amplifier. When used with an ipod classic sound result is clearly above the headphone output. The record gains in precision and clarity, soundstage opens. Operation is super simple, you plug and it works. Do not hesitate to buy good modulations cables to connect everything and for a ridiculous budget you happen to get a dematerialized system that holds the road very well and even more amazing. For those who hesitate with the purchase of a Dac Fiio the L11 has a quality alternative with a price / ease of use / excellent.