Industry Leading noise cancellation-two processors control 8 microphones for unprecedented noise cancellation. With Auto NC Optimizer, noise canceling is automatically optimized based on your wearing conditions and environment. Magnificent Sound, engineered to perfection with the new Integrated Processor V1.Effective range:32.81 ft Crystal clear hands-free calling with 4 beamforming microphones, precise voice pickup, and advanced audio signal processing. Up to 30-hour battery life with quick charging (3 min charge for 3 hours of playback) Ultra-comfortable, lightweight design with soft fit leather. FREQUENCY RANGE 2.4 GHz band (2.4000–2.4835 GHz)