For Red Shield alarm systems The GSM control unit works just like a security system and allows you to access and control your alarm system from anywhere in the world using your smartphone. Staying in control has never been easier! - Management of up to three alarm systems - Possible for up to eight people to access the system - Monitoring option via a built-in microphone - Remote activation and deactivation of the alarm system - Can be used in the GSM range (2G) 850/900/1800/1900 MHz https://elecena.pl/product/18992516/ws-210-skt-red-shield-alarm-system-gsm-module 2021-07-03 https://elecena.pl/product/18992516/ws-210-skt-red-shield-alarm-system-gsm-module 2025-02-02