The polling loop can listen to many devices, each with a unique name, on the same pair of wires. Panels that use EOL resistors must have a set of terminals at the panel for every pair of wires. Every EOL resistor must have its own pair of wires. The simplification in wiring for smart switches can sometimes cut the costs of wiring for an alarm system significantly. However, the smart panels and smart switches generally are more expensive than standard panels.
Smart switches do cost more, but they offer better security than normal switches.
Each smart switch has a unique name or address and checks in constantly with the panel. A smart switch damaged by lightning or other high voltage stops communicating to the panel. The alarm panel immediately responds to report the missing point of protection. Many factors affect this choice. The major factor is the construction and decoration of the premises.