Adapter

The object is an airline headphone adapter, which converts the dual mono audio jacks found on airplanes into a single stereo jack for standard headphones. Converts the aircraft's dual-prong jack to a standard 3.5mm (1/8") headphone jack. Allows use of personal headphones for in-flight entertainment systems. One of the two prongs can fold away, allowing it to be used in single-prong jacks as well. It is a genuine Sony part with part number 1-477-125-31.