Works with all 3.5 mm input devices. Specs. Driver diameter: 10 mm. Frequency: 20Hz-20KHz. Impedance: 32 ohms. Sensitivity: 100 dB+/-3dB. Max Input Power: 5mW. www.hottipsusa.com. Hottips! guarantees the operation of the product, its compliance with safety standards, and use of your device's wireless connection. If you are unsatisfied with the performance of this product, please send $3 to the above address for a replacement with an equal to or greater value item. Designed in Colorado, USA. Made responsibly in China.