What You Get: you will receive 30 pack blue classroom wire headphones, the enough quantity can be applied as classroom earphones, and each wrapped and sealed individually in opp bag, which are hygienic and convenient, and can avoid bumps and abrasions effectively Durable and Reliable: our headphones for school are made of ABS shell and soft rubber ear pads, lightweight and portable, and not easy to break, comfortable and soft ear pads are durable and elastic, more comfortable to wear, can be applied for long time, good for daily use by students, helping to enhance study concentration Universal Headphone Plug: these comfortable classroom headphones are about 4ft/ 120 cm long, compatible with 3.5 mm jack devices, have high fidelity stereo sound, and provide nice sound quality, suitable for most mobile phones, fitness equipment or other equipments, ideal for classroom use and school testing Adjustable and Noise Cancelling: our adjustable on ear headphones have an adjustable hea