Well, it was a small pocket computer with a small keyboard.
那是一个带小键盘的袖珍电脑。
英语百科
Pocket computer
A pocket computer was a small calculator-sized handheld programmable computer.
This specific category of computers existed primarily in the 1980s. Manufacturers included Casio, Hewlett-Packard, Sharp, Tandy/Radio Shack (Selling Casio and Sharp models under their own TRS line) and many more.