Sony's WH-ULT900N wireless headphones deliver a powerful audio experience, centered around the signature ULT POWER SOUND. At the press of a button, cycle between two distinct bass modes: ULT1 for deep, resonant low-frequencies and ULT2 for a more powerful, punchy bass. These headphones feature premium noise-canceling technology, utilizing a V1 processor and Dual Noise Sensor technology to effectively block out ambient sound. The Digital Sound Enhancement Engine (DSEE™) works to restore high-frequency details often lost in compressed audio files, ensuring a richer and more authentic listening experience. For clear communication, Precise Voice Pickup Technology and a wind-noise reduction structure ensure your voice is heard distinctly during calls. The battery provides up to 30 hours of playback with noise canceling active and extends to 50 hours when disabled.