The CS-10EM from Roland is a unique 2-in-1 product that allows you to create binaural recordings and monitor them at the same time. With the same form factor as in-ear headphones, each earpiece also holds a high-quality condenser microphone. Simply put them into your ears and connect them to a portable recorder such as the R-05 or R-09HR to record binaural stereo recordings of your environment. The microphones are powered by the recorder, accepting 2-10V.