The Smart Keyboard for the 10.5-inch iPad Pro was released along with the 10.5-inch iPad Pro and Apple Pencil on June 5, 2017. Apple press released noted:
“Apple Pencil and Smart Keyboard, available for purchase separately, bring breakthrough levels of precision and utility to iPad Pro. Advanced sensors in Apple Pencil measure both pressure and tilt for natural drawing, annotating and note-taking. A new full-sized Smart Keyboard has been custom designed for the 10.5-inch iPad Pro, offering a thin yet durable keyboard that never needs to be charged or paired over Bluetooth and is easily foldable into a protective Smart Cover.”
This Smart Keyboard used strong magnets to attach to the side of the iPad pro, but offered no back protection for the device. When in use, the Smart Keyboard folded into a triangle that allowed the iPad to sit back at an angle to allow for comfortable typing.
A 9to5Mac review from July 2017 noted that: “The Smart Keyboard makes a living by being thin, unassuming, and easy to tuck away when it’s not in use. It’s basically a Smart Cover with a little bit of extra thickness that allows it to double as a keyboard.”