Anker Liberty 4 Pro

Hear Every Detail:** Dual drivers (dynamic + balanced armature) for Hi-Res Audio. Immersive Sound:** Spatial Audio with head tracking for a theater-like experience. Crystal-Clear Calls:** 6 mics with noise cancellation for clear communication. Heart Rate Tracking:** Built-in sensor monitors heart rate during workouts. Long Battery Life:** Up to 9 hours of playtime, 28 total with the case. Fast Charging:** 15 mins charge = 3 hours of playtime. Personalized Sound:** Soundcore app for EQ customization & HearID ANC. Comfortable & Secure Fit:** CloudComfort ear tips for all-day wear. Multipoint Connection:** Connect to 2 devices simultaneously.