KZ1 I

 ultra-mini point source loudspeaker(Black/White)
 0.5” long-excursion neodymium magnet transducer
Frequency Response:  500 Hz – 18 kHz (-6 dB)
Rated Power:  3.5 W
Height - 37mm (1.5")  Width - 22mm (0.9") Depth - 11mm  (12")