A nice quality RCA "Y" splitter.
These are common for splitting a single audio channel into mono-stereo
configuration, You may also use these to split video signals such as one
composite to two monitors. One male RCA to 2 Female connectors. Each side is spiral-shield wound. Brass for the connectors.
Watch out for the big-box retail can be as high as $4.00 each! One year
warranty from wiredco.com