TDK Life on Record ST750 High Fidelity Over-Ear Headphones, Black (Discontinued by Manufacturer) Built-in amplifier increases the volume 6dB, enhances bass performance, reduces distortion and compensates for low power on MP3 devices High performance 40 mm drivers that deliver balanced sound with rich bass and pristine vocals Lightweight, low profile design is perfect for an active lifestyle or frequent travel Superior materials and components that deliver a distinct look and enhanced durability