Digital Signageaffects different KPIs depending on the sign's content and placement (in-store or outside).
KPIs related to in-store advertising includeAverage Dwell Time,Purchase Rate,Traffic,Average Product Price,Average Number of Items Purchased,Average Spend per Customer,Number of Purchases,Capture Rate,Stopped Visitors, and more.
This also varies by use case, but for example, if a customer sees in-store advertising from outside the store, it relates to theTrafficorCapture Rate,Stopped VisitorsKPIs.
After entering the store, it comes down to how the customer reacted to the ad, so it could be said to affect virtually every in-store KPI.
For example, if the ad's message is "10% off when you buy 2," it first affects how long a customer spends searching for products, so it impacts dwell time.
And as a signal of whether it led to a purchase, it relates toPurchase Rate,Average Product Price,Average Number of Items Purchased,Average Spend per Customer,Number of Purchases, andSales— basically every KPI related to sales.
For definitions of each KPI, seethisarticle.