Cool for School Headsets with In-Line Microphone The HamiltonBuhl FV line of headsets are cool for school! The latest design has a sleek appearance and offers rugged durability for everyday use. Kids and adults will be proud to sport our newest mid-sized headset to use with their tablet, computer, mobile device, almost anything. The FV series features compatibility with the latest technology by including a 3.5mm TRRS plug, in-line microphone and 5' braided cord. Ideal for classroom, individual use and testing.