UL qualifies alarm service companies for Listing and Certificate service by reviewing examples of their work. After the alarm company becomes "Listed," they can then issue certificates for each system they install.

When a certificate is issued for an alarm system, it is the installer's declaration that the system will be installed, maintained, tested and monitored in accordance with applicable codes and standards.

The certified installation is then subject to random physical audit by
UL's alarm system specialists. If noncompliance is found, the alarm
company must rectify the problem or face cancellation of the
Certificate.

At Matson Alarm, in compliance with UL, all of our systems are
redundant, which means that if one system fails, alarm signals will
be rerouted to the second system so that we never miss an alarm
signal.

Matson Alarm's UL Certificate.