Explanation:

Box 1: Timer
A Timer control in Power Apps is a control that can determine how your app responds after a certain amount of time passes.
Box 2: Barcode scanner
The Barcode scanner control for canvas apps scans barcodes, QR codes, and data-matrix codes on an Android or iOS device.
Box 3: Image
Image control in Power Apps is a control that shows an image from, for example, a local file or a data source.
If you add one or more Image controls to your app, you can show individual images that aren't part of a data set, or you can incorporate images from records in data sources.
Reference:
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/controls/control-new-barcode-scanner
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/controls/control-image