Lab Pack includes: HamiltonBuhl SchoolMate Personal-Sized, On-Ear Stereo Headphones; HamiltonBuhl Heavy-Duty Polyester Carry/Storage Case – Unmatched Durability and Stability; HamiltonBuhl Personal On-Ear Stereo Headphone; Heavy-Duty Polyester Carry Case with Collapsible Inner Frame Panel. Design: Personal, on-ear Cushions: Foam, replaceable Headband: Adjustable Plug: 3.5mm stereo, 120° thin barrel Cord: 5' Dura-Cord - chew-resistant, PVC-jacketed, braided nylon Speaker drivers: 30mm Frequency Response: 50Hz-16KHz Impedance: 32Ω Sensitivity: 90dB ±4dB Storage Bag: Anti-Lice, heavy-duty, write-on, moisture-resistant, reclosable bag. Helps prevent the spread of lice! When sealed in the bag, lice are killed in 24-48 hours without the use of chemicals Prop 65 Compliant