Adopt true 5.4 chip, which truly conforms to the technical specification of Bluetooth 5.4, and has dual-mode low-power transmission. Longer transmission distance: 150m long transmission distance (no barrier), single/double antenna design, effectively improving transmission distance. More stable transmission rate: 3Mbps transmission rate, providing high-speed file and audio data transmission. Ultra-low delay speed link, intelligent sleep wake-up to save energy, 24-bit check to resist interference, adaptive frequency hopping to reduce crosstalk. Complete backwards compatibility Bluetooth 2.0, Bluetooth 2.1, Bluetooth 3.0, Bluetooth 4.0, Bluetooth 5.0, Bluetooth 5.1 and other specifications. 5.4 Bluetooth adapter is a new product with high version and high speed, with strong compatibility, high speed and stability, and longer receiving distance. Applicable : it supports Windows7/win8.1/win10/11 mainstream ! Realize wireless Bluetooth connection between computer and other Bluetooth protocol devices (Bluetooth headset/speaker/mouse/keyboard/gamepad/mobile phone/printer, etc.) for audio, data and image transmission. Colour:black Material:plastic Package Contents: 1 * USB Bluetooth adapter 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.