Quick overview from the supplier:
Headset Logitech H111, Mic, 1 x mini-jack 3.5mm
P/N 981-000593
Height: 160 mm (6.3 in)
Width: 210 mm (8.3 in)
Depth: 50 mm (2.0 in)
Weight: 73.2 g (2.6 oz)
Input Impedance: 32 Ohms
Sensitivity (headphone): 100dB +/-3dB
Sensitivity (microphone): -58 dBV/µBar, -38 dBV/Pa +/- 4 dB
Frequency response (Headset): 20Hz to 20kHz
Frequency response (Microphone): 100 Hz –16,000 Hz
Cord length: 1.8 m (5.90 ft)
https://www.logitech.com/en-roeu/products/headsets/h111-stereo-headset.981-000593.html
