Streamline your workspace with the Surface Thunderbolt 4 dock, which offers ultra-fast data transfer. Eight convenient ports connect your webcam, smartphone and other accessories to up to two 4k monitors. Surface Thunderbolt 4 Dock offers ultra-fast data transfer, 8 versatile ports to charge accessories and connect up to two 4k monitors. This allows you to transfer data and files with compatible devices at up to 40Gbps and fully charge your laptop battery in around 2.5 hours. In addition, sustainability was also taken into account in the development, because the dock and the power supply housing are made of up to 20% recycled plastic. On the Surface Book 3, Pro 7, Pro X, Laptop 3 and Go 2, the maximum refresh rate of connected 4K monitors is 60 Hz. On the Pro 5, Pro 6, Laptop, Laptop 2, Go and Book 2, the maximum refresh rate for 4K monitors is 30 Hz.