CK 91 (with SE300B)
Frequency range: 20 Hz to 20 kHz.
Polar pattern: Cardioid.
Sensitivity: 10 mV/Pa (-40 dBV).
Impedance: 200 ohms.
Equivalent noise level: 17 dB-A.
Maximum SPL for 1% THD: 132 dB (142 dB with 10 dB preattenuation).
Power requirement: 9-52 V phantom power to DIN 45596.
Size: 19 Ø x 52 mm (0.7Ø x 2.0 in.).
Net weight: 35 g (1.2 oz.).

SE 300B Powering/Output Module.
Frequency range: 20 Hz to 20 kHz.
Sensitivity:: 10 mV/Pa (-40 dBV).
Impedance: 200 ohms.
Equivalent noise level: 17 dB-A (with Blue Line Capsule).
Maximum SPL for 1% THD: 132 db (142 db with 10 db preattenuation).
Power requirement: 9-52 V phantom power to DIN 45596.
Size: 19 Ø x 110 mm (0.7Ø x 4.3 in.).
Net weight: 80 g (2.8 oz.).