Please note that activation is required before use and there is no need to refresh the firmware, as the latest version is already installed. Upon receipt, only activation is needed. This model is Kmbox B+ version, designed for dual-computer setups. The B+ version operates in standalone mode, where computer B (control computer) runs the software and controls computer A (controlled terminal) without requiring any software on computer A. The serial port on device B+ connects to computer A, similar to the standard B version. The communication serial port is separated from the keyboard and mouse interfaces, enabling easier dual-computer control. USB connects to computer A, USB2 connects to control computer B, and USB3/4 connects to keyboard and mouse, allowing computer B to control computer A. Usage and compatibility are consistent with the original Kmbox B. This version is an upgraded model with improved functionality for dual-computer operations. To use, connect the serial port to computer A and install the CH341 serial driver on computer B, either manually or through the installation wizard for automatic setup. Type: With LCD Color: Transparent Material: Plastic Cable and controller colors may vary randomly and are not customizable; internal components are unaffected. Package Contents: 1 x Controller 2 x Cables Note: The actual product color may vary slightly due to lighting and display differences. Measurement tolerance is +/- 1-3 cm.