Fixed-charge back plate, permanently polarized condenser Polar Pattern Line + gradient Frequency Response 90-20,000 Hz Impedance 100 ohms Maximum Input Sound Level 127 dB SPL, 1 kHz at 1% T.H.D. Dynamic Range (typical) 107 dB, 1 kHz at Max SPL Phantom Power Requirements 11-52V DC, 2 mA typical Weight 80 g (2.8 oz)
https://www.amazon.com/Audio-Technica-AT875R-Gradient-Condenser-Microphone/dp/B000BQ79W0