LINEPAUDIO Audio Switcher RCA 2 in 1 Out / 1 in 2 Out A/B Switch Stereo Audio Splitter Box with No Distortion RCA Jack for Switching Between Computer Speakers and Headphones - Walmart.com
Amazon.com: TENEALAY 4-Way 3.5mm Stereo Audio Switch Input Signal Source Switcher Selector Splitter Box with line Volume Controller (4 in 1 Out / 1 in 4 Out) -MC41 : Electronics