Install and Testing Smoke Alarms

Because fire can grow and spread so quickly, having working smoke alarms in your home can mean the difference between life and death. But these life-saving devices are only effective when they're working properly. Smoke alarms with batteries that are dead, disconnected, or missing can't alert you to the dangers of smoke and fire. Follow these tips to ensure that your smoke alarms are installed correctly and tested regularly.
Once the alarm sounds, you may have as few as two minutes to escape. By learning how to effectively use the smoke alarm's early warning to get out safely, you'll reduce your risk of dying in a home fire.
The correct way to install smoke alarms;

A life-saving test: check your smoke alarms regularly

Replace the batteries in your smoke alarm once a year, or as soon as the alarm "chirps", warning that the battery is low.