Features: Bluetooth 5.1 chip design, with stronger compatibility and stability. Bluetooth reception (RX) and Bluetooth transmission (TX) in one. Equipped with a high-definition LED digital display screen, the working status and Bluetooth mode are clearly visible. Built-in DSP decoding chip, heavy and low sound effect, supporting adjustable three-gear gain. Upgrade the NFC function, and the phone senses one-touch connection. Controllable indicator light, soft and not dazzling, and the brightness of the light increases/decreases with the volume. Built-in 1200mAh rechargeable lithium battery, continuous listening to music for about 8 hours, with a battery life of up to 30 days Support USB flash disk/TF card playback and transmission, and support MP3/WMA/SBC/WAV/DTS/A52/FLAC/AAC/AIF/AMR/APP format. Built-in 6.5mm high-definition microphone hole, supporting microphone access for singing, and built-in anti-howling design. Specifications: Bluetooth version: Bluetooth V5.1 Support protocol: A2DP/AVRCP/HFP/SBC Frequency: 2.402GHz -2.480GHz Sensitivity: -85dBm