The Sescom LN2MIC-ZMH4-MON Line Out to Camera Mic In Headphone Tap Cable is designed to connect the line output of portable recorders, such as the Zoom H4N to the microphone inputs of compatible DSLR cameras (see compatibility chart below). The cable measures 18" in length, features male 1/8" (3.5mm) mini TRS connections, a female 1/8" (3.5mm) TRS input for headphone monitoring, and a -25dB level attenuation pad for "stepping down" line level audio, to microphone level. The cable is magnetically shielded which eliminates RFI (Radio Frequency Interference) noise from cell phones, PDA's, WIFI, etc.