Kurzweil HDP1 Studio Reference Headphones
They are foldable, closed-back supra-aural headphones designed to be easy to carry.
It can be easily carried thanks to its foldable design.

Digital pianos are suitable for personal recordings, musical studies, films, games, etc.

Transducer: 50mm Dynamic, Closed cavity
Ear Connection: Supra-aural
Frequency Response: 10-30,000 Hz
Impedance: 32Ω
Sensitivity: 98dB (+/-3dB @1mW)
Rated Power: 300mW
Maximum Power: 1800mW
Plug Type: 3.5mm, 6.3mm (1/4") adapter included
Cable Type: Straight and coiled options