AKG Headphones K812

I received these as a gift from an acquaintance, but I don't have an opportunity to use them, so I'm selling them. I've only listened to them about twice, so they are practically unused and in like-new condition.

■ Featuring AKG's newly developed transducer, the largest 53mm diameter driver unit in AKG's headphone history. The driver unit boasts an extremely powerful magnetic flux density of 1.5 Tesla, providing driving power far exceeding conventional headphones. This allows for an abundance of sound information, accurately reproducing even the finest details without omission.
■ The ultra-thin, two-layer Two-Layer Voice Coil System offers excellent responsiveness to sound, achieving an astonishing frequency response of 5Hz to 54,000Hz, compatible with high-resolution audio sources. It reproduces a deep sense of realism, like listening to a live performance, and a three-dimensional spatial representation as if sound is coming from all directions.
■ The large ear pads that completely cover the ears are made of thick, supple protein leather, fitting snugly like they're adhering to your ears.
■ The mesh headband, designed to prevent stuffiness, features the Self-Adjust Mechanism familiar to the K Series. The headband automatically adjusts to your head size, providing a stress-free, lightweight fit without feeling the weight on your head.
■ With a low impedance of 36Ω, these headphones can be driven effectively not only by home and studio audio equipment but also by portable audio devices like laptops and iPods/iPhones.
■ The cable is detachable, allowing for replacement with higher-quality cables (re-cabling) and providing peace of mind in case of accidental cable breakage.
■ A stylish wooden headphone stand is included.

■ Headphones
■ Type: Open-air
■ Sensitivity (1kHz): 96dB SPL/mW
■ Playback Frequency Range: 5Hz - 54,000kHz
■ Maximum Input Power: 300mW
■ Impedance: 36Ω
■ Ear Pads: Around-ear, protein leather
■ Plug: 3.5mm stereo mini (gold-plated)
■ Cable: Approx. 3.0m (single-sided, detachable)
■ Weight (excluding cable): Approx. 398g
■ Accessories:
・Dedicated wooden headphone stand
・Cable