SC6 Dual TRRS input and Headphone Output for Smartphones. The SC6 is an input/output breakout box for smartphones and tablets. With two TRRS inputs and one stereo headphone output, the unit connects to any TRRS device and allows the use of one or two smartLav microphones as well as headphones for monitoring and playback. With the SC6 users can monitor audio from the smartLav, as well as input two smartLavs into the one mono channel in interview or dual-dialogue scenarios. (Note that the two microphone inputs will be recorded to the same channel)