Experience personalized audio with Denon PerL Personalized ANC Earbuds, featuring Masimo Adaptive Acoustic Technology (AAT) for a unique hearing profile and Denon's signature vivid and spacious sound. Tune out the world with active noise cancellation or stay aware with Social Mode. Enjoy a full day of listening with 24 hours of total battery life (6 hours per charge plus 3 additional charges in the case). These earbuds are also weather and sweat resistant, rated IPX4, making them suitable for workouts or commutes in the rain. Customize your experience with the Denon Headphones app to adjust touch controls, select noise cancelling or social mode, and personalize your sound with Immersion Mode for bass control. With five ear tip options and two wing sizes, they ensure a comfortable and secure fit. Since 1910, Denon has been a leader in audio innovation, consistently delivering groundbreaking sound technology. This product is a seller refurbished item in full working order, with excellent cosmetic condition showing some very minor signs of use. In the box: Wireless Charging Case, USB-C Charging Cable, Set of Ear Tips, Manual. A 12-month return to base warranty is provided.