Nest Labs issues recall of smoke, carbon monoxide alarms

California-based Nest Labs recalls more than 400,000 smoke alarms.  The recall is necessary because of a feature that could prevent the device from going off immediately, officials said.

Nest's Protect Smoke Plus Carbon Monoxide Alarms have a function that allows users to temporarily silence alerts – just by waving their arms near the unit.  Nest is asking all users to connect their devices to the interview through a wireless network for an automatic update.