Pack of 100 Headphones in bulk, each headphone individually packaged and sealed ^^ The swiveling earcup design allows easy storage when youre not using them, and enhances portability when youre traveling ^^ Lightweight & adjustable housing for rugged durability, great for Students, Schools, Hospitals, Hotels, Musuems, Gyms, Libraries and more ^^ Great sound quality helps students and kids to greatly enhance focus, learning and testing experience. The cord length is about 4 feet/ 1.2 meter, standard 3.5 mm jack compatible with smartphones, tablets, MP3, laptops and desktops ^^ XOSDA SUPPORT -1 Year Free warranty and quick response customer service, if you have any issues with items, feel free to contact us via email.