Questions about Busch-Jaeger ProfessionalLine

According to the description, it is possible to integrate the entire Busch-free@home® system via an alarm stick https://www.busch-jaeger.de/produkt/alarmstick and the wireless module. I only use the wireless modules so that when one smoke detector sounds the alarm, the others also play the alarm sound.

Thank you for your helpful answer

This article can be networked with up to 20 detectors via a 2-wire line or a radio module. Suitable for external systems: Can be connected to systems such as Busch-free@home® via the radio module Busch-Smoke alarm RF in combination with the Busch-free@home® alarm stick. This article Busch-Jaeger smoke alarm ProfessionalLINE cannot be networked with other detectors Simpler version: Has basic functions such as test button and muting, but no possibility to connect to external systems. Both models have a permanently installed lithium battery with a service life of at least 10 years and are certified in accordance with DIN EN 14604.

Thank you very much for your advice! :) LG