How does the So3 work with alexa? what commands?
Hello Jonathan, The S03 does work with the Alexa, it can use alexa to arm, disarm, query, and trigger an alarm. Thanks, Jessica Customer Service Manager
Can I add a glass break sensor and an additional siren to this system?
Hello Roy, Of course! Here is the link for the glass break sensors: https://www.fortresssecuritystore.com/s02-glass.html The link for sirens is as followed: https://www.fortresssecuritystore.com/catalogsearch/result/?q=siren
types of batteris used in motion detector & contact sensor
Hello Bhanuvadan, The motion detectors use a 9V battery and the contact sensors use 23A Style batteries Thanks, Jessica Customer Service Manager