Introducing the most technically sophisticated and durable headphone ever manufactured by Califone. This Titanium series Mac PC compatible stereo headphone will help optimize differentiated learning experiences with breakthroughs in safety, performance, comfort and durability.Built to help students not only learn content material, the HPK-1020 is also designed to teach them about appropriate volume listening levels when using a headphone. By integrating Sentinel Technology into the earcup, the volume playback level is restricted to the ASHA-recommended maximum of 85 decibels for safe listening practices (this feature can be disarmed for students with special needs). Califone Headphone, In-line Volume, PC,Mac, Wired Via Ergoguys is one of many Over-The-Ear Headphones available through Office Depot. Made by Califone.