TheRDE SC6 Dual TRRS Input and Headphone Output for Smartphonesis an input/output breakout box for smartphones and tablets. It has two TRRS inputs and one stereo headphone output. It connects to any TRRS device, such as your smartphone, and allows you to use one or two smartLav microphones while providing a headphone jack for monitoring and playback. Use it to monitor audio from the smartLav and input two smartLavs into the mono channel in interview or dual-dialog applications.