Features: HD LED Digital Display: The working status and Bluetooth-compatible mode are clearly visible. Adopt Bluetooth-compatible 5.0 chip design with stronger compatibility and stability. 2-in-1 Wireless Audio Adapter: Bluetooth-compatible receiver (RX) Bluetooth-compatible transmitter (TX) two in one design toggle switch switching. Compact Design: The knob button is adjusted to dynamically display on the screen. Cool breathing light red/blue soft and not dazzling. Long Lasting Battery: Built-in 400mAh rechargeable lithium battery with a battery life of about 5 hours and Type-C interface charging. Support USB (USB flash disk) and TF card playing and transmitting. Easy to Use: Built-in high-definition microphone supporting wireless music listening hands-free call and navigation. The product connection is simple without any complicated driving and APP downloading Notice: Actual color may be slightly different from the image due to different display and light effect. Please allow 1-3cm deviation due to manual measurement. Specifications: Material: ABS Version: Bluetooth-compatible 5.0 Transmission distance: 10 meters Full set weight: 180g (bare-metal 120g) Product size: 6.7*6.7*2.0cm Packing size: 15*11*3.7cm Product color: Black includes: 1*Wireless audio adapter 1*3.5mm audio cable 1*RCA Lotus cable 1*Type-C Charging cable "