Blonder, Greg2019-08-022019-08-022015-01-222014-09-10Greg Blonder. "Headphone extension system." U.S. Patent application 14/482,596.US-2015023519-A114/482,596https://hdl.handle.net/2144/36990In an embodiment, a music playing and listening apparatus comprising at least one speaker, at least one audio input receiver, at least one audio output interface at least one amplifier, and at least one power source.Patent438184