The Leeo Smart Alert is designed to listen for smoke and carbon monoxide alarms that emit the standardized T3/T4 signal.  As of May 2016, Smart Alert will also listen for continuos tone water alarms on the Leeo App.

More about Smoke Alarms: 

The Smoke Alarm T3 signal consists of long beeps in sequences of 3 separated by a pause. Visit the link below to hear what a T3 signal sounds like.  Please note that not all new alarms use this signal.

 https://soundcloud.com/leeo-13/example-of-a-smoke-alarm

This alarm signal has been the standard required by the National Fire Protection Association and UL since 1996. Most smoke alarms manufactured before 1996 make a different sound, the continuous signal, which sounds like a continuous series of rapid beeps. If you have continuous smoke alarms, Leeo will be unable to detect them – however, if the alarms in your home were manufactured before 1996, they are almost certainly due for an update! Since the sensors in smoke detectors only last for 7-10 years, we strongly recommend replacing your detectors if your smoke alarms do not match the T3 signal above.

More about Carbon Monoxide Alarms: 
The T4 signal consists of short beeps in sequences of 4 separated by a pause. Visit the link below for a sample of the T4 alarm signal – and remember, carbon monoxide detectors wear out more quickly than smoke detectors, requiring replacement every 5-7 years.

https://soundcloud.com/leeo-13/carbon-monoxide-alarm-example

Water Alarms: 
Currently Supported / Tested Water Alarms: https://amzn.com/w/3K11QX5HSPA9E