Audio-Technica BPHS1XF4

Audio Technica BPHS1XF4 (BPHS1-XF4) Broadcast stereo headset with dynamic boom microphone with XLR-4F cable. Created for use with intercom systems, this rugged communications headset offers natural, highly intelligible and focused vocal reproduction, closed-back circumaural (around-the-ear) ear cups to seal out background noise, and a high-output dynamic microphone mounted on a flexible gooseneck boom.
The headset’s microphone has a cardioid polar pattern tailored for pickup of speech with maximum voice intelligibility over a wide range of frequencies. It is more sensitive to sound originating directly in front of the element, making it useful in reducing pickup of unwanted sounds. The flexible gooseneck boom swivels for easy positioning on either the right or left side.
The BPHS1-XF4 is supplied with a 2m detachable, replaceable cable along with 4-pin XLRF which provides unbalanced audio signal from the microphone and a mono signal to the headset. Three windscreens are also provided to reduce wind noise and wind.
The BPHS1-XF4 Unidirectional Microphone...
INCLUDED IN BOX
1x BPHS1XF4 Broadcast stereo headset with dynamic boom microphone
3x Windscreens
1x Spare connector screw

Headphones 
Type Closed-back Dynamic (Headphone)
Cardioid Dynamic (Microphone)
Driver Diameter 40 mm
Magnet Neodymium
Voice Coil Copper-clad aluminum wire
Frequency Response 20-20,000 Hz
Maximum Input Power 1,600 mW at 1 kHz
Sensitivity 100 dB (Headphone)
-57 dB (1.4 mV) re 1V at 1 Pa (Microphone)
Impedance 65 ohms
Weight 264 g (9.3 oz)
Cable - Detachable 2 m (6.6') long with 8-pin connector at headset end; 4-pin XLRF-type connector output
Microphone 
Frequency Response 40-20,000 Hz
Impedance 560 ohms
Dimensions 180.1 mm long (boom), microphone extended;
24.0 mmdiameter (microphone)