Anker Soundcore Liberty 2 Pro TWS Bluetooth True Wireless Earphones with Studio Performance, 8h Playtime, HearID Personalized EQ Astria Coaxial Acoustic Architecture: A state-of-the-art design that integrates a customized Knowles balanced armature and an 11mm dynamic driver. Astria completely eliminates interference while producing harmonized treble and bass for jaw-dropping sound. In-Ear Studio Performance: Liberty 2 Pro true wireless earphones are recommended by 10 Grammy Award-winning producers. Sound is delivered with impeccable depth and nuance; every instrument presented perfectly across an expansive soundstage. 8-Hour Playtime: And get 3 more full recharges from the charging case. Place the earbuds inside for only 10 minutes and get up to 2 hours of listening, then recharge the case via fast-charge USB-C or a Qi-compatible wireless charger. HearID Custom Sound: To ensure everyone gets a perfect listening experience via Liberty 2 Pro true wireless earphones, HearID intelligently analyses your unique hearing profile and creates a tailor-made sound set up just for your ears. Quad-Microphone Calls: With 4 microphones and cVc 8.0 noise reduction, your voice is isolated and transmitted in high-clarity for a seamless hands-free experience. Note: angle the microphone towards your mouth for optimized calls.