IT-12D/HPM-535 Professional...
Made in Taiwan
Mic. Freq-Response of IT-12D: 80 to 16,000 Hz
Earphone Freq-Response of IT-12D: 100 to 15,000 Hz
Frequency Response HPM-535: 20 to 20,000 Hz
Impedance of HPM-535: 64Ω
Sensitivity of HPM-535 (at 1000Hz): 104 dB/mW