The CalDigit TS4 Thunderbolt 4 Dock is a used docking station with 18 ports. It is compatible with Apple, Dell, and other universal brands. The gray CalDigit TS4 model has Thunderbolt 4, Thunderbolt 3, Audio Out, DisplayPort, Ethernet (RJ-45), USB 3.0, Memory Card(s) Reader, and USB-C ports. It is USB-powered and has a built-in USB port and memory card reader. The CalDigit TS4 is compatible with universal product lines.