Sony MDR-XB250 Extra Bass headphones. The specifications for this model include:
Driver Unit: 30 mm dynamic, dome type
Frequency Response: 5–22,000 Hz
Sensitivity: 98 dB/mW
Impedance: 24 Ω at 1 kHz
Cable Length: 1.2 m, Y-type
Plug: Gold-plated L-shaped stereo mini plug
Weight: Approximately 140 g (without cord)
Features: Closed, dynamic headphone type with a sealed acoustic design for sound isolation and powerful bass.