20 Sets of Headphones,each bulk headphone individually sealed The student headphones come with soft ear cushions for long-lasting comfort design to eliminate ear fatigue Wired headphones with a 3.5mm jack can be instantly used with any smart device: computers, laptops, PCs, smartphones, tablets, and MacBooks Classroom headphones adjustable headband is perfect for kids teens and adults of different sizes. You can comfortably wear your on-ear headphones for hours or end without feeling the slightest discomfort Bulk headphones are also ideal for remote learning online courses movie watching music listening and travel OSSZIT Service: If you have any questions,please contact us,we will solve for you soon and give you the most satisfying reply