Key Features • • Industry-leading noise cancellation, personalized for you • Superlative sound, exquisitely designed • Crystal clear hands-free calls • Up to 30 hours of battery life with quick charge (3-min charge for 3 hours of playback) • Ergonomic design, lightweight with soft touch leather • To enhance noise cancellation performance, the headset uses two technologies: Personalized Noise Cancelling Optimizer, specially designed for you, and Atmospheric Pressure Optimizing, specially designed for air travel • Integrated Analog Amplifier in the HD Noise Cancelling Processor QN1 for unparalleled signal-to-noise ratio for low distortion and exceptional sound quality for mobile devices • Sony's Ambient Sound Setting | The headset connects to the Noise Cancellation Optimizer app, allowing you to hear essential sounds, such as transportation announcements, while listening on the go (From experience) I've had the headset for three months and haven't used it much, but its noise isolation is excellent and it's good for the gym. You can't even hear what's around you when you wear it, and it's also good for calls.