First Alert, a manufacturer of carbon monoxide alarms, advises that if your alarm beeps four times, you should evacuate your house immediately. READ MORE: People are slashing £468 off Sky bills ...

What's up? Usually, when a smoke alarm or carbon monoxide alarm is chirping (one quick little beep every one to two minutes or so), it means the battery is dying. Even if your smoke alarm is ...

There are two new products on offer: a Smart Smoke Alarm, and a Combination Smoke + Carbon Monoxide Alarm ... on battery seven days before it starts beeping. But it's tech like this – a smart ...