It transmits sound by your throat vibration rather than microphone. Effectively avoids environmental noise and makes the call clearer. With a high-quality transparent acoustic tube that is discreet and difficult to notice, this device is ideal for surveillance and security applications, including airports, casinos, crowd control at conventions and concerts, and other work environments requiring private communication. Perfect for use in high ambient noise environments such as driving, riding motorcycles, and cycling. Compatible with all devices that have a 3.5mm jack, such as cell phones, smartphones, laptops, computers, and gaming devices. (Compatible with iPhone 4s / 5 / 5c / 5s / 6 / 6 Plus, iPad mini / air 2 / 4, Samsung Galaxy S4 / S5, Note 2 / 3 / 4, M3, Blackberry, etc.) Ideal for use in law enforcement, nightclubs, bars, security operations, restaurants, hotels, warehouses, and noisy environments. Function: Video game, monitor headphone Support APP: No Is wireless: No Support Apt-x: No Volume Control: Yes Style: Headphone Active Noise-Cancellation: Yes Support Memory Card: No Sensitivity: 100+/-2dB Wireless Type: None Waterproof: No Frequency Response Range: 20-20kHz Communication: Wired Vocalism Principle: Dynamic With Microphone: Yes Control Button: Yes Resistance: 32 ohm Plug Type: Line Type Net Weight: about 2.2oz / 62g Compatible: All 3.5mm jack enabled devices Color: Black Material: ABS Connectors: 3.5mm Package Contents: 1 x Throat Mic earphone Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture to appear slightly different from the real thing. Measurement may vary by +/- 1-3cm.