This item is REFURBISHED. To ensure a rewarding listening experience the AirPods Pro utilize Adaptive EQ to automatically sculpt the tonal output to suit your unique ear shape. Their custom high-excursion drivers and high dynamic range amplifiers deliver clear detailed sound with bass down to 20 Hz all while keeping distortion low and upholding extended battery life. The flexible silicone eartips come in three sizes and advanced algorithms allow the AirPods Pro to analyze the fit and let you know if the current eartip size is giving the ideal seal.