What is the main difference between a monitored and a self-monitored alarm system?

The main difference is who is responsible for reacting to alarms. A monitored alarm system sends critical events to a 24/7 monitoring center as well as to the owner. A self-monitored system relies on the owner and selected contacts to see app notifications and take action. Monitored systems are usually better for higher-risk or often-empty properties, while self-monitoring can work for low-risk spaces.