This twenty-pack of lightweight stereo headphones is ideal for casual listening. Its adjustable headband, on-ear earcups and recessed wiring make it a convenient and comfortable headphone for multipurpose classroom applications, computer labs, libraries and listening centers. Their 3.5mm plugs fit all computers, tablets (such as iPads and Chromebooks) and smartphones, making it an economical alternative for online assessments. . Fully adjustable, lightweight headband fits all students . Recessed wiring resists prying fingers for classroom safety . Soft and comfortable ear cushions . On-ear ambient noise-reducing earcups • Windows and Mac compatibility • Permanently attached cord • Connects with MP3 players, tablets, media players and computers • Warranty for school use - unlike headphones purchased at a consumer electronics store whose warranties would be voided if used in schools