When Audio-Technica engineers developed the new SonicPro in-ear monitor (IM) headphones， they centered the design around the three most important components of a superb listening experience: 1) Sound， 2) Fit and 3) Functionality. 

As the flagship of the IM line， the ATH-IM04 is Audio-Technica’s first in ear monitor headphones to feature quad balanced armature drivers. The complex tuning circuitry housed within each driver divides and distributes your audio signal for an ideal， accurate sound reproduction that is so pure you have to hear it to believe it. And the innovation doesn’t stop there – the headphones were specially designed to fit and seal within the ear for the ultimate in-ear monitoring. Each pair comes equipped with three sizes of silicone earpieces (S/M/L) and Comply™ foam earpieces (M) for a customized fit. Detachable cables with formable wire and a carrying case add additional convenience and functionality to the headphones， allowing you to easily take them wherever life takes you.