this is our newest monitoring headphone, have red and yellow color, owning the highest quality and best price. use color boxes. Type: Closed TypeLoudhailer Diameter: 44mm Impedance: 32ΩSensitivity: 96±3dBFrequency Response:15Hz-25kHzMax. Power:800mWCable Length: about 3.0 MPlug: 3.5mm +6.3mm Stereo

monitoring headphone--HP4000