Features: acrylic carrying case; 4 ft. cord; includes 3 sizes silicone ear pads. Driver Unit: 10 mm; Frequency Response: 20 Hz - 20 KHz; Speaker Resistance: 32 ohms +/- 15%; Speaker Sensitivity: 100 +/- 3 dB; Plug: 3.5 mm stereo. Hottips! guarantees the operation of the product. If you are unsatisfied with the performance of this product, please send $4 to the below address for a replacement with an equal or greater value item. Www,hottipsusa.com. Please recycle. Colorado Company. Designed in Colorado, USA. Made responsible in China. Made in China.