Business Backpack with USB Charger Port, Expandable, Water Resistant, Travel, Laptop, Work Computer Up to 17″ – Black

Microphone Type: UnidirectionalInput Impedance: 32 OhmsSensitivity (headphone): 100 dB +/-3 dBSensitivity (microphone): -58dBV/μBar, -38dBV/Pa +/-4 dBFrequency response (Headset): 20 Hz – 20 kHzFrequency response (Microphone): 100Hz-16KHzAnalog connection with 3.5mm audio in and audio out jacks ( two pin)