This story was delivered to Business Insider Intelligence “E-Commerce Briefing” subscribers hours before appearing on Business Insider. To be the first to know, please click here.

Walmart recently obtained a patent for a surveillance system that would use a series of sensors placed around the checkout area to monitor audio data, BuzzFeed reports. This data includes beeps, the sound of bags rustling, and conversations between shoppers and associates. It’s unclear whether the retailer will actually build and employ this technology in stores, but the patent’s text suggests that the intended use would be “tracking performance metrics for employees to ensure that the employees are performing their jobs efficiently.”

Walmart E-Commerce Sales Year-Over-Year Growth BI Intelligence

The technology could benefit Walmart by giving it a clearer view of how to streamline the customer experience. If Walmart decides to implement the new surveillance system, it will be able to closely monitor several metrics that could help it boost performance.

For example, the distance of customer voices from…