Mobile devices enable students to learn at their own pace or in differentiated groups; Headsets necessary in classrooms with multiple devices; First headsets for use with mobile devices/iPad & Android compatible, MP3 & MP4 players w/3.5mm mic-in; 4100AVT, Washable Titanium HPK-1010T, Deluxe Multimedia 3066AVT, Discovery DS-8VT, Lightweight Multimedia 3065AVT; Single plug & audio w/3 stripes on tip