• Four-level CityMix Smart active noise cancellation that automatically adapts to the environment. • Bluetooth 4.1 wireless connection with aptX technology for high-fidelity sound. • Up to 8 hours of playback battery life with fast charging in one hour. • Lightweight and flexible design with a neckband and IPX4 protection against sweat and splashes. • Integrated dual microphone for clear and crisp calls. • Motion sensor with automatic shut-off function to optimize battery life. • Soft rubber surface for greater comfort and reduction of friction noise. • Includes different sizes of eartips for an optimal fit inside the ear.