These noise-reducing headphones allow your students to clearly hear lessons without being distracted by outside noise. Primo Stereo headphones are made form ABS plastic so they are rugged and reliable. With it's versatile 3.5mm stereo plug these wired headphones can connect to most audio devices including computers, tablets, smartphones and mp3 players. Each headset comes in its own heavy duty , write-on, water resistant re-closable storage bag. This bag, when sealed with the headphones, will kill lice within 24-48 hours which makes them safe and sanitary