Singing Smoke Alarm

Smoke alarm speakers aren't used often. They could be linked to a home entertainment system (and your security system) to do so much more:

You could set your system to play soothing nature sounds, or set it to a radio station.

You could set the system to play a certain song during a fire (I would set it to Ring of Fire, but other appropriate songs come to mind). You could also download various siren sounds off the internet. If you like WWII movies, you could download an air raid siren. Or maybe you'd prefer a U-Boat siren (awoo-ga! awoo-ga!).

If your smoke detectors had built-in microphones, and your home entertainment system was hooked up to the internet, the system could turn the mics on during a fire, dial the police automatically, and act as an emergency speaker-phone. If the detectors had built in thermometers, they could tell the fire department how hot the fire was and which rooms were affected.

If you linked your home entertainment system to your alarm system, the microphones could also record intruders.