Features: Acrylic carrying case; 4 ft cord; Includes 3 sizes of silicone ear pads. Driver Unit: 10 mm; Frequency Response: 20Hz-20KHz; Speaker Resistance: 32 (omega) +/- 3dB; Plug: 3.5mm stereo. www.hottipsusa.com. Colorado company. Designed in Colorado, USA. Made responsibly in China. Made in China.