Nest Labs’ has redefined what people should expect from their smoke & carbon monoxide alarms. Nest Protect: Smoke + Carbon Monoxide™ does more than sound a shrill alarm. It announces where and what the problem is. Before it sounds a piercing alarm, Nest Protect provides a Heads-Up warning that can be silenced with a wave of a hand – no more swinging towels or brooms to try to quiet a false alarm. It integrates with mobile devices and sends a message if the batteries run low, avoiding the midnight low-battery chirp.