SpinBox

What's a SpinBox anyhow?

A SpinBox is a GUI widget for adjusting a number using up/down arrow buttons. For instance, here is one example from Mudlet's settings window:

They also often allow you to set the value directly. I've attempted to recreate this basic functionality in a Geyser object.

Very interesting, but how do I use it?

Have a gander at: API Docs
SpinBox: Examples