SENNHEISER Pro Audio HSP 2-3

​professional condenser headset microphone with omni-directional polar pattern, frequency response: 20Hz-20kHz, adjustable length and size, Sennheiser EW series mini-jack connector, 150dB maximum SPL. Weight: 6.5g. Color: Beige. 

Technical Data 
Frequency response 20 - 20000 Hz 
Weight Without cable: 6,5 g 
Diameter capsule: O 4,8 mm 
boomarm: 1,1 mm 
Sensitivity in free field, no load (1kHz) 2 mV/Pa 
Nominal impedance 1000 ? 
Min. terminating impedance 4700 ? 
Equivalent noise level 28 dB(A) 
Maximum sound pressure level (passiv) 150 dB 
Current consumption ca. 250 µA 
Operating voltage (stand alone) 4,5-15 V