Smart Keyboard

The Smart Keyboard is a hardware keyboard and cover originally designed by Apple for the 1st-generation iPad Pro.

Description
First introduced in November 2015, the Smart Keyboard resembles a MacBook keyboard that has been built into a Smart Cover, allowing it to serve as both a cover for the display, a stand, and a physical keyboard. It features keys covered in woven fabric that is resistant to water and other liquids. Despite positive reviews, it was criticized for its high price.

Supported models
Measuring 4mm thick, the Smart Keyboard does not include external wires or Bluetooth, and does not contain batteries that would need to be charged. Instead, it is powered by the magnetic Smart Connector, a new port that was introduced with the iPad Pro, and later added to other models:
 * iPad Pro (2nd generation) 10.5-inch
 * iPad Air (3rd generation) 10.5-inch
 * iPad (7th and 8th generation) 10.2-inch

Discontinued models
In November 2018, the 12.9 and 9.7-inch models for the 1st and 2nd-generation iPad Pros were superseded by the Smart Keyboard Folio for the 3rd-generation iPad Pro. Though a 10.5-inch version for the 2nd-generation iPad Pro and 3rd-generation iPad Air was superseded by a 10.2-inch version for the 8th-generation iPad on September 18, 2020, the exterior dimensions are virtually unchanged and the 10.x-inch models are interchangeable with one another.

Articles

 * Apple's Smart Keyboard is not worth $170 by Dave Smith at Business Insider (2015-09-10)
 * Apple Smart Keyboard for iPad Pro Review by Sascha Segan at PC Magazine (2015-11-24)