Beyerdynamic DT108 H400-B Single-Ear Headset with Dynamic Microphone, made in Germany

Link: global.beyerdynamic | Owner's Manual [PDF]

Headphones: Dynamic, closed, circumaural
Impedance: 400 Ohm
Sensitivity: 94 dB
Frequency range: 30-20,000 Hz
Weight: 283 g
Microphone: Dynamic