Google said Wednesday it forgot to mention that it included a microphone in its Nest Secure home alarm system, the latest privacy flub by one of the tech industry's leading collectors of personal information.

The company said earlier this month that its voice assistant feature would be available on the system's Nest Guard, which controls home alarm sensors.

But Google hadn't told consumers about the device's built-in microphone when it began selling the hubs in the fall of 2017. As recently as January , the product specs for the device made no mention of a microphone.

Google said in a statemen...