With the Sony WF-1000X you'll have more mobility and less ambient noise. These Bluetooth earbuds are equipped with active noise canceling. Use this to mute the sound of the wind or a moving train, so your music will sound extra clear. You can easily adjust the level of noise canceling. The in-ear earbuds are equipped with special ear hooks, so they'll stay firmly put in your ears. When the battery's empty, you can easily charge it with the portable charger. After charging, you'll have an additional 3 hours of battery use. The earbuds detect when they're put in or taken out of the charger and will automatically turn on or off accordingly.Note: always download the app's latest software update to prevent problems and to ensure continued optimal use of the earbuds.