A state-of-the-art design which integrates a customized Knowles balanced armature and an 11mm dynamic driver into a single body. Aligned direct-to-ear, Astria completely eliminates interference while producing harmonized treble and bass for jaw-dropping sound. Liberty 2 Pro is recommended by 10 Grammy Award winning producers. Sound is delivered at stadium-scale with impeccable depth and nuance. Every instrument presented perfectly across an expansive soundstage for a stunning representation of what the sound engineer and artist hoped you would hear. A single charge of the earbuds gives 8 hours of audio, with 4 more full recharges from the charging case. The charging case recharges via fast-charge USB-C or wireless charging, and provides the earbuds with 2 hours of listening from a 10-minute charge. To ensure everyone gets a perfect listening experience, HearID intelligently analyses your unique hearing profile and creates a tailor-made sound setup just for your ears. Or take complete control of the sound with an adjustable EQ or 22 preset sound profiles. With 4 microphones and cVc 8.0 noise reduction, your voice is isolated and transmitted in high-clarity for a seamless hands-free experience.