The Mobile Alert is a GSM module with backup batteries that sends alarm messages after power failure and flow switch switching. The Mobile Alert alerts you when the pump fails due to pump failure or power outages. The unit's flow switch trips when no more water flows past it. You will be notified by SMS that your pump has failed so you can look at the problem immediately. The delay time up to sending an alarm can be customized (default 1 minute, maximum 16 minutes) so that, for example, no SMS messages are sent during filter coils when a pump is temporarily off. The irrigation alert is for sprinkler reels, contains a lithium-on battery. The Mobile Alert Deepwell is the Mobile alert equipped with a 20mA pressure sensor. The Mobile Alert Sensor is the Mobile Alert equipped with a Crab type sensor.