There are two sides to SKAA. A transmit side and a receive side. Transmitters throw your audio while receivers—such as SKAA speakers & headphones—catch your audio and play it out loud.
SKAA transmitters are those little doodads which send audio from that source of yours to SKAA speakers and headphones. No matter whether your audio source thingy is super common or insanely weird, odds are SKAAstore stocks the perfect transmitter for the job.