VONOTO 3.5mm 1/8" 2 male to 1 female Headphone Jack Socket Audio adapter 3.5mm female to double male F/M adapter VONOTO 3.5mm 2 male to 1 female Headphone Jack Socket Audio adapter Use the Airline adapter to connect your own headphones to the in-flight entertainment system on the airplane for listening to music and movies The airline adapters converts a standard headphone stereo mini plug (1/8", 3.5mm) to a dual-prong airline jack Most of the headphones (portable, noise cancelling) are equipped with the 1/8" plug that will fit this adapter This adapter is designed with a smaller rounded "base" to fit with All 2-prong airline jack. (Some adapters doesn't and will not fit everywhere)