SpecializedSound Trusound&reg; Airplane Airline Adapter for Headphones FULLY COMPATIBLE with 3.5mm audio headphones. DYNAMIC DESIGN to fit all devices with standard dual or triple input headphone jack ports. PERFECT FOR AIRPLANES and on in flight airline entertainment systems to reduce background noise. ENJOY POWERFUL BALANCED SOUND for music or movies during any airplane travel. EXPERIENCE our Trusound technology.