Premium Sound via ACAA 3.0 Enjoy sound with deep, punchy bass, accurate mids, and clear treble direct from our acoustic system's dual dynamic drivers. Its wide frequency range allows every part of the song to shine for detail-rich listening. 360° Immersive Spatial Audio As you listen to music and watch movies, the built-in gyroscope and spatial audio algorithm track your head movements to always keep you at the center of the sound for a completely immersive experience. CloudComfort Ear Tips The flexible dual-layer structure adapts to the shape of your ear canal for a comfortable fit throughout your listening session. Liberty 4 true wireless earbuds come with 4 sizes of ear tips to ensure you find the right fit. Heart Rate Tracking The in-ear heart rate sensor tracks your heart rate as you listen throughout the day. Wear Liberty 4 true wireless earbuds and check your daily data while working out, and more via soundcore Wellness in the app. Personalized Sound Liberty 4 true wireless earbuds use soundcore's unique technology that analyzes your ears and the way you hear sound to create a personalized sound profile that's unique to you.