Model: 2401426 - Somfy Protexium Start GSM Kit Wireless Alarm System Constant self-checking: In the event of a problem, the central unit notifies you and inspects every component. window open, low battery... Feedback: An audible signal and an indicator light inform you when the alarm is activated or deactivated, indicating that the command has been understood. Component self-defense: an alert sounds in the event that a component is attempted to be disconnected or destroyed. Dual radio frequency transmission: the system will keep working even if one of the channels is jammed. Operational life: Four years under typical daily use for all accessories. Using the backup battery, an SMS alert is sent in the event of a power outage. Advantages Simple installation: this kit installs in a few clicks. Every component of your system