What is one feature that makes hardwired smoke detectors advantageous?

Hardwired smoke detectors are advantageous primarily because they provide a constant power source. This means that they are connected directly to the building's electrical system, which eliminates the need to frequently replace batteries as required in battery-operated models. This consistent power supply ensures that the detectors remain operational at all times, significantly enhancing safety since they can immediately detect smoke or fire without the risk of battery depletion.

Other features, like installation outdoors or requiring no maintenance, do not apply to hardwired systems. In fact, while they do require some maintenance, being hardwired provides a stability that battery-operated models lack. Furthermore, the notion that they work without needing a power source would falsely imply that hardwired detectors can function without being connected to electricity, which contradicts the fundamental design of these devices.