The Sony Headphones MDR-XB90/BC (Black) features 16mm Drivers for a powerful sound. The drivers are dynamic type. The headphones consist of PET diaphragm with Neodymium magnets for superior sonic output. The in-ear earphones have a frequency response range of 4Hz to 27000Hz. It ensures low and thumping bass, clear mid-range and sharp treble sounds. The Sony Headphones MDR-XB90/BC (Black) has a sensitivity of 106dB/mW. It has a power handling capacity of 200mW. The headphones have an impedance of 16Ohms at 1kHz. The Sony Headphones MDR-XB90/BC (Black)are built for style and comfort. The unit comes with Fitting Assist, which creates the perfect fit in your ear canal for superior comfort. The headphones come with soft and comfortable Hybrid Silicone Earbuds. The earbuds create an accurate and ergonomic fit and are designed for prolonged usage with minimal discomfort. The earbuds feature Noise Isolation, which blocks unwanted external noise, allowing you to enjoy your music in peace. It comes with a tangle-free and serrated cord which offers unhindered movement for maximum comfort. The L-Shaped Gold Plated Stereo Mini plug ensures maximum connectivity to a broad range of devices too. To ensure complete peace of mind, the Sony Headphones MDR-XB90/BC (Black) comes with 1 Year Warranty.