These are the Bluetooth earbuds that use active noise cancelling technology to eliminate distracting background noise for uninterrupted audio enjoyment. Microphones inside the earbuds sense disruptive low-frequency noise, prompting internal circuitry to generate a countering frequency that cancels those unwanted sounds. The earbuds connect to an Android/iOS device within 33' via Bluetooth and have a built-in microphone for phone calls. Includes three sizes of memory foam ear fittings and three sizes of wingtips for optimal comfort and fit. With aircraft aluminum construction, a water- and dust-resistant IP64 rating, and play/pause/skip/repeat/volume buttons. Charges via USB with included cable; a 21/2-hour charge provides up to six hours of power.