---
title: penLowerSide
framework: appkit
role: symbol
role_heading: Type Property
path: appkit/nsevent/buttonmask-swift.struct/penlowerside
---

# penLowerSide

A mask that matches the button on the lower side of the device.

## Declaration

```swift
static var penLowerSide: NSEvent.ButtonMask { get }
```

## See Also

### Getting the Tablet Button Masks

- [penTip](appkit/nsevent/buttonmask-swift.struct/pentip.md)
- [penUpperSide](appkit/nsevent/buttonmask-swift.struct/penupperside.md)