20 Quantity - Hi-Fi Stereo Headphone (Great for School & Library, H5) by goBulk Ideal for Schools, Libraries, Testing, Training, Educational Use, Hospitals, Medical Offices, Dental Offices, Spa, Fitness, Music Listening, Museums and much more. Works with iPads, Chromebooks, Tablets, Laptops, PC, iMacs, Desktop Computers, iPhones, Android Phones, Smart Phones, iPods, MP3 Players, and any audio devices that use 3.5mm connection. Hi-Fi Stereo Sound; 4.9 Feet Cord Length; Sensitivity: 99db/mW (20-20,000 Hz) Connector: 3.5mm Gold Plated Right Angle Plug; Certification: CE & RoHS Packaging: Individually Wrapped in Plastic Bag