These are high quality black stereo earbuds. Earbud headphones are most commonly used with iPods, iPads, iPhones, MP3 players, and other devices. The jack is a standard stereo jack that fits just about every audio device. This listing is for 100 pieces. They look exactly as the picture shows. These are part of the Earbuds For Education Initiative. A portion of each purchase goes to fund the TFD Unlimited Award. Every sale helps kids go to college. New generic Universal In-Ear 3.5mm Stereo Headset Fits all standard headphone jacks Quantity: 100 x Listen to your favorite music on an iPod or MP3 player with these high quality stereo earphones. Fits comfortable in your pocket, purse or backpack. Excellent sound quality in all ranges. Impedance: 32 OHM Maximum Power Input: 5 mW Sensitivity: 115db (front), 102db (back) Frequency Response: 20 Hz to 20KHz Connector: 3.5mm diameter stereo plug