سوال ۲۰ کنکور ارشد مهندسی برق ۱۴۰۰

Passage 1 (paragraph 4):

The demand for "green energy" has resulted in devices and products designed for its acquisition being produced by many competing companies. An average user of a panel will be interested mainly in ready-made plug & play modules attached to the panels, but, on the other hand, electronic engineers may be searching for converter modules designed to be integrated into user's own devices. The target applications may include illuminated traffic signs, monitoring devices or systems operating within IoT networks.

Why does the author mention "monitoring devices" in paragraph 4?