Denon Perl True Wireless earbuds let you create a personalized sound profile via Masimo Adaptive Acoustic Technology (AAT) for audio that is perfectly tuned to you. Denon signature sound hand-tuned by the Denon Sound Master delivers a vivid and spacious quality. With active noise cancelation, choose quiet or hear your surroundings in Social Mode. Confidently take calls with crystal clear voice audio. Use the Denon Perl app to create your profile and fully customize your listening experience. Plus, with six hours of battery life and 24 additional hours from the case with wireless case charging -you can keep the music going all day.