BeyerDynamic DT990 Professional Acoustically Open Headphones 250 Ohms w/ FiiO A3 Amp

Transmission Type: Wired
Headphone Design (Operating Principle): Open
Headphone Impedance: 250 ohms
Headphone Frequency Response: 5 - 35.000 Hz
Nominal Sound Pressure Level: 96 dB
Construction: Circumaural (around the ear)
Cable & Plug: Coiled connecting cable with mini-jack plug (3.5 mm) and 1/4" adapter (6.35 mm)
Net Weight without Packaging: 250 g