Fangrui Product Details Using A True 5.4 Bluetooth Chip, In Line With Bluetooth 5.4 Technical Specifications, Lmp: 13.x, Ble or Dual-mode Low-power Transmission. Farther Transmission Distance: 150m Ultra-long Transmission Distance (unobstructed), Antenna Upgrade, Strong Signal. More Stable Transmission Rate: 3mbps Transmission Rate, Providing High-speed File And Audio Data Transmission. Driver-free Use: Supports Driver-free Plug-and-play, No Cd Installation Required, Convenient And Simple. Ultra-low Latency And High-speed Connection, Intelligent Sleep Wake-up Energy Saving, 24-bit Check To Resist Interference, Adaptive Frequency Hopping To Reduce Crosstalk. Colour:black Material:plastic Package Contents: 1 x Bluetooth Adapter 1 x English Instruction Manual Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thing. The Measurement Allowed Error Is 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.