Earbuds Bulk: you will receive 100 packs of wired headphones in individual package, available in black and white color, enough for class students to choose their favorite or share with others; Note: no built in microphone Soft Wearing Experience: these earbuds are mainly made of PVC material, the ear plugs are made of silicone, not easy to tear or break, comfortable enough to sit on the ears for hours, providing clear sound that does not feel jarring and is suitable for your everyday use Sound Quality: these earphones can reduce noise and have stereo surround sound, 108 (dB) sensitivity, highly restored sound, keep ears from irritation and stay away from noise Compatible with Most Devices: classroom earbuds are 0.9 m/ 2.95 ft long, compatible with 3.5 mm jack devices, can be associated with most mobile phones, computers, laptops, MP3, gym equipment, also a nice choice for school testing Multiple Usage: these colored headphones bulk can be applied in schools, libraries, hote