Bluetooth 5.3 chip for smoother transmission and more stable wireless connections Sound pickup and noise reduction algorithm that actively recognizes human voices according to the scene, reduces environmental noise interference, improves reception quality, and minimizes impurities Not only Bluetooth earphones but also MP3 playback and a recording device, providing versatile functionality in a single unit Dual mode switching with Bluetooth and insertable memory card support, enabling seamless transition between wireless playback and cardbased playback/recording Use scenarios Daily listening and voice communication: enjoy wireless Bluetooth audio with clear voice pickup during commuting, exercising, or casual use Offline music and media playback: switch to card mode to play MP3s stored on the insertable memory card Portable recording: use the device for capturing audio in meetings, interviews, or field recordings in its recording mode Compatibility and performance highlights Functions: Bluetooth wireless streaming, MP3 playback, and recording capability Modes: seamless switching between Bluetooth and card insertion modes Performance: sceneaware voice recognition and noise reduction for clearer audio in varying environments Material and size notes The description does not specify size or material; focus is on feature set, mode switching, and audio performance.