Use with mp3 players, cell phones, other audio devices. Adjustable ear cushions. Dynamic driver. Superior sound quality. Adjustable ear cushions for a comfortable fit. Specifications: 10 mm speaker driver unit provides dynamic sound. Shielded cord with 3.5 mm plug for use with personal audio systems. Frequency response: 20-20,000 Hz. Impedance: 32 ohms. Cord Length: 4 ft. +/- 10%. This Jasco product comes with a 1 year limited warranty. Visit www.jascoproducts.com for details. Made in China.