Built for ultimate athletic performance, the redesigned Powerbeats Pro 2 is the most advanced product we've ever made, with flexible secure-fit earhooks to stay locked in as you train. The updated acoustic architecture and Personalized Spatial Audio with dynamic head tracking deliver powerful, immersive sound, with clear highs, rich mid-range tones and deep bass. To give you absolute training focus, Powerbeats Pro 2 has the most advanced Active Noise Cancelling (ANC) we've ever developed, plus Transparency mode so that you can hear the world around you, ensuring the best listening experience in any training environment. Adaptive EQ tailors sound to the bespoke fit and seal created by your earbuds, using the advanced inward-facing microphones to measure what you're hearing, then adjusting the frequencies of your music to you. The refined earhook design has undergone over 1,500 hours of testing with nearly a thousand athletes to ensure a comfortable, secure fit for all ear shapes, actions and intensity levels. Hyper-accurate Heart Rate Monitoring for workouts gives athletes real-time data on their performance, with LED optical sensors pulsing over 100 times per second to measure blood flow.