It transmits sound by your throat vibration rather than microphone. Effectively avoid environmental noise and make the call clearer. With the best-quality transparent acoustic tube that could hardly be detected by people around you, this is also for surveillance purposes and security at airports, casinos, crowd control at conventions and concerts, and other working environment requiring discreet communications. This is exceptionally for usage in high ambient environment such as driving, riding motorcycles and bicycles. Compatible with all 3.5mm jack enabled devices, such as cell phone, smart phone, laptop, computer, gaming. (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 Blackberry, etc. ) Excellent for use in police, , nightclubs, bars, , security, restaurants, hotels, , warehouses, and noisy environments. Function: for 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: 20-20Hz Communication: Wired Vocalism Principle: Dynamic With Microphone: Yes Control Button: Yes Resistance: 32 ohm Plug Type: Line Type Specifications: Net Weight: about 2.2oz / 62g Compatible: All 3.5mm jack enabled devices colour: black Material: ABS size: Length: 1.2m standard plug: 3.5mm Package Contents: 1 x Throat Mic earphone 1 x Spare earplug 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.