Denon PerL In-Ear Wireless HeadphonesDenon 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. They're hand tuned by the Denon Sound Master to deliver a vivid and spacious sound quality. Personalized sound via Masimo AAT Active noise cancelation Denon signature sound 6 hour battery*, 18 via case** Customizable touch controls Weather and sweat resistant Denon sound is now personal A