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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).