SENNHEISER Pro Audio HSP 2

​Headworn Microphone - Gooseneck Microphone Headset 

Cable length 5.2 ft. (1.6 m) 
Current consumption Approx. 250 ?A 
Diameter 1.1 mm boom arm 
Diameter 4.8 mm microphone head 
Equivalent noise level 28 dB(A) 
Frequency response 20 - 20,000 Hz 
Max. sound pressure level (passive) 150 dB 
Min. terminating impedance 4,700 ? 
Nominal impedance (@ 1 kHz) 1,000 ? 
Operating voltage (stand alone) 4.5-15 V 
Polar pattern Omni-directional 
Sensitivity in free field, no load (1kHz) 2 mV/Pa 
Weight 0.2 oz. (6.5 g) (without cable)