... output, input -Retractable headband design Multi-function card headsetDirect Reading TF card functionAudio output, inputRetractable headband designRechargeable systemlarge and ... Apple, BlackBerry, Nokia, 3.5MM audio port phone Computers, laptops and speakersRetractable headband design Simple headband design, ... :-52dB THD:<5% Packing: PVC gift box + paper card , 40pcs/ctn, Carton Size: 59x47x46.5cm,N.W ...