Stereo Headphone with Wipe-Cleanable Silicone Earpads (Neodymium Speaker) Excellent Sound: Hi-Fi Neodymium Speaker Great for Schools, Libraries, Testings, Fitness, Computer Labs, Hospitals, Training, Museums, Promotional Gifts and much more. Works with all iPods, iPhones, iPads, Google Chromebooks, Tablets, Laptops, Computers, PC, iMacs, Smart Phones, MP3 Players, and any audio device that has 3.5mm audio jack. (Wire Length: 5 Feet), (Neodymium: 30mm Magnet), (Impedance: 32 ohm), (Resonance Frequency: 160 Hz), (Sensitivity: 101 db/mW), (Output: 50mW) Packaging: Bulk (Individually Wrapped in Plastic Bag); Certification: CE & RoHS