HS400 Noise Cancelling Headphone

AU-HS400 USB Headset Noise Cancelling Headphones With Microphone For Laptop PC, On-Ear Wired Office Call Center Headset For PC With MIC, In-line Control Head Phone Microphone For Skype Zoom Meeting

Headphone Type: On-ear
Earcup housing materials: ABS 
Frequency Response:  20~20000Hz 
Sensitivity(S.P.L) dB:  116db±3db (S.P.L.at1khz)178mv 
Driver Diameter: ф 40mm 
Type of speaker driver:  Dynamic 
Sensitivity:  -40±3dB  (0dB=1V/Pa,at 1KHz)
Core size:  Dia. 6.0mm*2.7mm (unidirectional)-Earlap
Core size:  Dia. 9.5mm*5.0mm (unidirectional) - Outer microphone