Wide Compatibility: this labs headphone cable is 4 ft/1.2 meter long with a standard 3.5 mm headphone jack, compatible with phones, tablets, laptops, desktops, MP3, and other electronic equipment, it's a good helper for daily life, work and study. Quality Material: this over ear headset shell is made of quality plastic material, which is strong and sturdy, flexible and bendable, not easy to break or deform, light and portable, comfortable and smooth to wear, and can serve you for a long time. Comfortable To Wear: this students earphone earmuff is made of PU leather material, which is soft and lightweight, comfortable to ear, suitable for long term use without any discomfort; The headband is adjustable to easily fit your head shape, suitable for adults, children and teens. Package Includes: you will get 12 pieces of classroom headphones in 12 colors, like yellow, pink, sky blue, green, orange, purple, black, dark blue, red, white, gray, rose red, the rich colors are enough to meet the color preferences of most people, and the sufficient quantity is enough for you to share with your family, friends, classmates and students.