> ## Documentation Index > Fetch the complete documentation index at: https://docs.spline.design/llms.txt > Use this file to discover all available pages before exploring further. # Variable Change Event The Variable Change Event allows you to trigger actions when a specific variable changes. ## Variable Change Event Properties #### Select Variable On the first dropdown, select the variable that the event should check for changes. Once the event detects a change in the variable value, it will trigger the Actions added to it. The dropdown list will access any variables available on the current file. image The following variable types can be used: | Variable type | Defined by | Usage | | -------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------- | | 🤹 Variables | Number, String, Boolean, Timers, Counter or Random | Variables can store values that are reusable. For detailed explanation read the [Variables](https://docs.spline.design/d17e9b49f5284f19b309fce92af0d011) doc. | | ℹ️ Object Property | Object’s position, rotation, or scale (X, Y, Z), or it’s width, height and depth as a number, e.g.: `100` | Capture object property changes, and save them as variables to create advanced interactions. | | 🖱️ Mouse Position (2D) | The position of the mouse on the screen is defined by X and Y as numbers. | Animate or manipulate objects based on the mouse position | | 💥 Mouse Hit Position (3D) | The position of the mouse hitting an object in 3D space, as Position X, Y, or Z of the hit location, or the Position X, Y, and Z of the object that was hit. | Create interactions based on specific hit positions, e.g.: visualize hit in 3D space. |