Razer Kraken Pro Analog Gaming Headset This Certified Refurbished product is manufacturer refurbished, shows limited or no wear, and includes all original accessories plus a 90-day warranty Optimized weight for comfortable extended wear - Fully retractable microphone Powerful drivers and sound isolation for highest-quality gaming audio 40 mm Drivers with Neodymium Magnets for powerful crisp sound Headphone Frequency Response: 20  20,000 Hz / Microphone Frequency Response: 100  10,000 Hz