3.5mm Single-Ear Telephone Headset
Simple light easy call
Rotary noise cancelling microphone
The headband is adjustable
Noise reduction shipping mark
Speaker: φ40mm/ Sensitivity: 116±3db/ Impedance: 32±15%Ω/ Frequency response: 20~20KHz
Microphone: Omni-directional/ Mic unit diameter: φ6.0±5.0mm/ Mic Sensitivity: -35±3db/ 
Cable: 1.80±0.01m/ 4-pole 3.5mm audio jack