Z4 Multi is an advanced version of the Z4 Farsi app that allows users to control up to 8 compatible alarm systems with just one mobile phone. It is the perfect solution for those who want to monitor and control multiple alarm systems at once.

With Z4 Multi, users can easily arm, disarm, and monitor their alarm systems remotely. The app also includes features such as SMS and autodialer, which allow users to receive alerts and notifications in case of an emergency.

For those who prefer an English interface, Z4 Ultra is also available. However, if you only want to control one alarm system, it's better to use Z4 Farsi.

Overall, Z4 Multi is a great app for anyone who wants a convenient and efficient way to monitor and control multiple alarm systems from their mobile phone.