The Nest Protect thinks, speaks and alerts your smartphone, bringing the traditional smoke detector into the 21st century. No longer are you at the mercy of an immovable system that was put in by an electrician. Nest Protect detects both smoke and carbon monoxide. It will give you an early voice warning “heads up, there’s smoke in the kitchen”. If there is no fire you can cancel the alarm using your smartphone. No incessant beeping either if the batteries run down. It’s even useful at night time and will illuminate your room as you walk through. Learn more here.