Dear customer, please note that activation is required before use and there is no need to refresh the firmware (we already installed the latest version of the firmware when sending it out). Once received, only activation is required and there is no need to refresh the firmware. Please note! Kmbox B+version(B+is suitable for dual computers). The B+version is Pro, and the dual computer is that the B computer controls the A computer. The software runs on the B computer, and the A computer does not open anything. The B+serial port is connected to the A computer, which is the same as the B version. This is a stand-alone mode. Where the serial port is inserted, the serial port driver is installed. Install the CH341 drive, or install wizard for automatic installation. This version is an upgraded version of kmbox B. The main differences are as follows: Separate the communication serial port from the keyboard and mouse, which can easily realize dual computer control. (USB receiving computer A, USB2 is connected to control computer B, USB3/4 is connected to keyboard and mouse, which can realize the function of computer B controlling computer A) The usage of the B+version is consistent with that of the kmbox , and all are compatible. If you need to operate dual computers, you are recommended to buy the B+version. Serial port is connected to AI analysis computer B. Controlled terminal computer A. B computer can directly control computer A. Type:With LCD Colour:transparent Material:plastic Cable color, controller is random, don't accept the specified, internal does not affect use Package Contents: 1 x Controller 2 x cables 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.6903314097329