1.Earphone,mp3 ,compute,pc, headset,Neckband,headphone , easy to carry; 2.Comfortable all-inclusive probe covers, 1Earphone, ... mp3 ,compute,pc, headset,Neckband,headphone Mic Dimensions Ø6.0X5.0mmSensitivity `-41dB±3dBlmpedance ≤2.2kΩDirectivity ...