Meet the Roost Smoke Alarm: a smart alarm that connects to WiFi and offers fast detection of smoldering and flaming fires. It alerts you on your phone when you are away. You also get notification when alarm batteries are low. The smoke alarm also notifies your family.
The RSA-400 model works for smoke, fire, carbon monoxide, and natural gas. You also get a smart battery backup. Costs under $80 at this time.