Google and its parent company Alphabet Inc. have been hit with a lawsuit claiming they violate California privacy and consumer protection laws by secretly recording snippets of individuals’ conversations and having workers listen to them to improve the functionality of products that use Google Assistant.

Google Assistant-enabled devices, including mobile phones and tablets using the Android operating system, Google Home speakers, smart displays, cars, TVs, and laptops, listen for two sets of so-called hot words—“Hey Google” and “Okay Google”—to detect user commands. Those commands, in turn, cause the devices to do things such as play certain music or videos, search the internet for information, or set timers.