The Sennheiser XS Lav is an omnidirectional clip-on lavalier microphone with a 3.5mm TRRS connector designed for use with mobile devices and computers for recording purposes. It has a 2m cable and only works with devices that have a TRRS jack. On the other hand, the RØDE SC3 is a 3.5mm TRRS to TRS adaptor that allows microphones with a TRRS output to connect to 3.5mm TRS devices like cameras and audio recorders. It features gold-plated contacts for superior audio reproduction. Both products are ideal for podcast, video, and voice-over recordings that require a simple, quality set-up.