3.5mm Stereo Mini Plug to 2 RCA Females Y-Cable: Most mobile devices use the 3.5mm stereo headphone output, most home audio systems with an amplifier or receiver use RCA jacks for audio inputs.This Stereo Audio Adapter Extension Cable 3.5mm Male to 2 RCA Female is ideal for adapting the output of your PC, or personal audio to stereo RCA jacks for a quick transition from headphone to rca connection.Simply plug the 3.5mm end to the headphone jack on your audio device and the 2RCA ends to the sound system.