Driver Size: 10 mm. Use with MP3 players, cell phones, other audio devices. Stereo sound. Adjustable ear cushion for a perfect fit. Changeable cushions for most 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%. www.jascoproducts.com. This Jasco product comes with a 1 year limited warranty. Visit www.jascoproducts.com for details. Made in China.