Using a true 5.4 Bluetooth chip, in line with Bluetooth 5.4 technical specifications, LMP: 13.X, BLE/EDR 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 CRC check to resist interference, adaptive frequency hopping to reduce crosstalk. Colour:Black Material:Plastic Package Contents: 1 * Bluetooth adapter 1 * 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.