Surface Pro 3 Docking Station, Surface Pro 4 Type Cover, Arc Touch Mouse Surface Edition and Surface Pen are four Microsoft Surface accessories. All four are official Microsoft products and are available at Microsoft Store as of 2015.
The Surface Pro 3 Docking Station allows users to turn their tablets into desktop systems. In addition to charging the Surface Pro 3, the docking station adds three USB 3.0 and two USB 2.0 ports, one Ethernet port and one Mini DisplayPort to the device. Using these ports, users can connect HD monitors up to 3,840 by 2,600 pixels resolution, full-size keyboards and printers to the device.
Despite the name, the Surface Pro 4 Type Cover also works with Surface Pro 3. The cover features a keyboard on the front and has magnetic connectors. The keyboard also has an accelerometer, a touchpad that can detect up to five fingers at the same time and a full row of function keys. The Type Cover is available in black, blue, bright blue, red and teal.
Microsoft Arc Touch Mouse Surface Edition is a portable mouse that draws inspiration from the design of the Surface line. Featuring Microsoft's BlueTrack Technology, the mouse can work on rough wood surfaces or carpets. It connects to Surface tablets via Bluetooth 4.0, uses two AAA batteries and comes with a 1-year limited hardware warranty.
Surface Pen is an advanced stylus that Microsoft designed for the Surface line. With 1,024 levels of pressure sensitivity, the pen can detect how hard the user presses the pen against the screen and adjust line width. The pen has an eraser that also serves as a button at the back, a right click button near the tip and a magnet on the side that clings to Surface Pro 4 and Surface Book.