3.5mm Jack Audio Switcher Selector Bi-Directional Audio Switch Splitter Box 4 In 1 Out / 4 In 1 Out 3.5mm Audio Switcher. 1 4 Port 3.5mm Audio Switch Switcher. Connect 4 audio sources (like CD player / computer/Phone/MP3) to 1/4 ports and 1 audio output (like speakers) to IN/OUT port;.
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