1. Advanced bluetooth chip: V5.4 bluetooth delivers stable and fast signal transmission, providing a seamless connection.2. 40mm Large Speaker: Exceptional sound quality delivered by a 40mm speaker. The high, medium, and low frequency are more balanced, enhancing the three-dimensional sense of hearing.3. 360° HiFi Sound: Experience immersive sound with 360° HiFi Stereo Sound, which envelops you in rich, spacious sound, like in the real secene.4. 25H Playback Time: The 300mAh battery provides up to 25 hours of music playback, making it ideal for long listening sessions.