One example of a calculator watch, a piece of technology that reached peak popularity during the 1980s.
Their heyday was in the 1980s and could both tell time and crunch numbers—the calculator watch.
The first calculator watch was released in the mid 1970s, but they became popular in the early to mid 1980s. These watched, typically with number buttons on the face of the watch, sometimes offered a variety of features. Some could compute scientific calculations, others could store phone numbers, still others keep could track of appointments.
One of the big producers of calculator watches is Casio, with models such as the Databank, which is still made in some form to this day.
While still produced as mentioned, they have fallen out of vogue as cell phones and tablets offer a wider variety of functions with more room for controls and screen size.