Different sensors send single and multiple alerts depending on their design purpose. 

Power ON and OFF,  Internet ON and OFF, and all battery-powered devices such as Water Level, Mail, DIY1, Floodstop, and Sensor send a single alert.

Water Detector, Non-contact water level, temperature, voltage, and A/C powered Water Level alerts are sent continuously, subject to the following limitations:

All repeating notifications are throttled.  This is done for two reasons: one is to prevent flooding communications with unnecessary messages. And the second one is to save us some money: we have to pay for every text message!

Each device is allotted a number of text messages per month. In case of repeating alerts within a certain interval, that interval will be increased. When the issue has been resolved, the alert interval will be reset back to the original 5 minutes.

Here are the details on how the text interval is managed:

• The first two messages are sent at 5 minute intervals
• If there is an alert that comes within 5 minutes of the previous one, the alert interval is increased to 15 minutes
• After that, if there is an alert that comes within 15 minutes of the previous one, the alert interval is increased to 30 minutes
• After that, if there is an alert that comes within 30 minutes of the previous one, the alert interval is increased to 60 minutes
• And the next alert that will indicate that no action has been taken will cause the alert interval to increase to 6 hours. It will stay there until the break between alerts is over 6 hours which will reset it back to 5 minutes.

This will limit the number of messages sent when someone leaves a water alert in a cup of water for testing and leaves it there for a few days - as has been known to happen!

There is one critical caveat to this formula:  we understand that an initial setup and testing period is important.  So this throttling takes effect 24 hours AFTER your device has been ADDED. This gives our users a day to configure and test their devices without imposing any throttling!