Valve has decided to throw their hat into the handheld ring with their new Steam Deck. This portable PC is similar to Nintendo's switch in that it offers a hybrid approach to gaming.
You can take the Steam Deck on the go in its portable mode, or you can throw it on a dock hooked up to a monitor or television screen. However, that is where the similarities to the Switch end.
The Steam Deck's dock has two USB 2.0 ports and one USB 3.1 port, allowing you to attach wireless dongles for wireless mice and keyboards. Additionally, the dock has video outputs for both computer monitors and televisions.