The item is a 3.5mm airplane airline headphone jack adapter, which can be used to convert a standard dual airplane socket into a 3.5mm stereo socket, and allow you to use your personal stereo headphones or earphones to enjoy the films and music channels, instead of using the standard headphones supplied by the airline. Features - Color: Black. - Material: Brass, plastic. - Size: 3.70X2.70X1.00cm/1.45X1.06X0.39 inch. - Rated load: DC500V. - Insulation resistance: 100M. - Allow using your own 3.5mm audio jack headphone to enjoy the onboard radio, movies, etc. - Fits all standard airline connectors and headphone stereo . - Easy to use, just connect this adapter with your headphone and the audio jack in your aircraft seat. - Use your favourite headphones. Save money on airline headphones. - Compact size. Easy to put into your purse, handbag, pocket or anywhere and carry when you travel. Package list: 3 x adapters