On March 3, 2017, the Nintendo Switch Pro Controller was released to the public. It contains all the necessary joysticks and buttons need for various games, simialrly to Xbox and Playstation controllers. It holds a transparent cover with special features such as motion controls, HD rumble, built-in amiibo scanner and etc.
Within the motherboard of the controller, there is an engraving of stating the words "THX2ALLGAMEFANS!". To see it, hold the right downwards and look through the plastic socket using a light source. This easter egg was first discovered by a Japanese Twitter user, Geo Stream, on March 4, 2017, one day after the controller's launch.