It transmits sound through throat vibrations, not through a microphone. Effectively avoid ambient noise and make the call clearer. With the best quality transparent acoustic wire, which can hardly be detected by the people around you, it is also ideal for surveillance and security purposes in airports, casinos, crowd control at conventions and concerts, and other working environments that require discreet communication. It is extremely ideal for use in high ambient conditions such as riding, riding motorcycles and bicycles. Compatible with all devices that support 3.5mm, such as mobile phone, smartphone, laptop, computer, games. (For 4s/5/5c/5s/6/6 Plus, for/mini/air 2/4, for Galaxy S4/S5, note 2/3/4, M3, for, for, for, for blackberry, etc.)For use in police, nightclubs, bars, security, restaurants, hotels, warehouses and noisy environments. Function: for, monitor headphonesAPP support: noIt's wireless: noSupport-x: noVolume control: yesStyle: headphonesActive noise cancellation: yesMemory card support: noSensitivity: 100+/-2dBTuerld-type: noneWaterproof: noFrequency response range: 20-20HzCommunication: wiredVocalism principle: dynamicWith microphone: yesControl button: yesResistance: 32 ohmPlug type: line typeSpecifications:Net weight: About 2.2oz / 62gCompatible: all Devices Included 3.5mmColor: BlackMaterial: ABS Size: : 3.5mm Package Contents:1 x Throat Microphone EarphonesOnly the above package content, other products are not included. Note: The light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error is +/- 1-3cm.