Sony's lightest Wireless Noise-Cancelling headband ever. Adjustable ambient sound mode and adaptive sound control features tailors sound to suit the environment around you. Up to 35-hour battery life with quick charging (3 min charge for up to 1-hour of playback). High sound quality and well-balanced sound tuning. Crystal clear hands-free calling and voice assistant with Precise Voice Pickup technology. Multipoint connection allows you to quickly switch between two devices at once.