The phrase "keyboard base" refers to the foundation or bottom part of a keyboard. It is the part that contains the keys and supports the rest of the keyboard.
Sentences with «keyboard base»
Hybrid PCs now have large tablets and thick keyboard bases. (indianexpress.com)
The standard keyboard base is primarily composed of black aluminum. (techradar.com)
Mobile phone network Three has just announced it will be carrying the new Nokia Qwerty keyboard based E7 handset, in the New Year. (onemobilering.com)