Designed with busy classrooms in mind, and ideal for use in schools, libraries and computer labs, this HamiltonBuhl Lab Pack includes 12 blue Favoritz? stereo headsets with in-line microphone and 3.5mm TRRS plug. Each headset comes in its own heavy-duty, anti-lice, write-on, moisture-resistant, resealable bag. The compact lockable carry case (lock not included) makes transporting and storing all 12 headsets easy and convenient. Cool for School Favoritz? headsets have a sleek appearance and offer a rugged durability for everyday use. Students will be proud to sport this mid-sized headset to use with their tablet, computer, mobile device, almost anything.