Price Match Guarantee Denon PerL Wireless Noise-Canceling Earbuds with Personalized Sound Get precise sound customization with Denon PerL Wireless Noise-Canceling Earbuds. These earbuds utilize Masimo Adaptive Acoustic Technology to analyze otoacoustic emissions, creating a personalized hearing profile. This data is then integrated with a self-learning engine to optimize your music experience and reveal each musical detail with clarity. Easily create your own hearing profile using the Denon Head