Nintendo Switch Joy-Con Controller Pair Blue & Neon Yellow

The square button on the left Joy-Con is a Capture button for quickly taking pictures, and eventually video, of gameplay.
Each Joy Con has an accelerometer and gyroscope for Wii-like motion controls.
Each Joy Con has individual shoulder buttons located on the inside of the controller to use when separated for cooperative play.
The Joy Con also has a strap accessory that clips onto the inside part of the controller for motion gameplay, which also offers larger shoulder buttons.
The Joy Con has advanced haptic feedback, which Nintendo is calling “HD Rumble.” The company claims that HD Rumble is precise enough to simulate the feel of different numbers of ice cubes falling into a glass, or the sensation of water being poured.
The right Joy Con controller has an IR camera that can determine the shapes and distance of objects.