Jan 02, 2022 · 2. Exclusive ID design, no sense of lightness,fortable and semi-in-ear wearing. 3.13mm big speaker unit, AAC high-fidelity audio decoding, enjoy HIFI sound. 4. Infrared in-ear detection IC, put on and play, take off and pause, intelligently listen to songs. 5.14.5H long-lasting battery life, worry-free travel, always apanied by music. 6.