What is a critical feature of fire alarms besides sound?

A critical feature of fire alarms, besides sound, is visual alerts like flashing lights. This feature is essential because it helps ensure that individuals with hearing impairments or those who may not be able to hear the alarm can still be alerted to a fire emergency. The incorporation of visual signals, such as strobe lights, significantly enhances safety in environments where such considerations are necessary, particularly in public buildings, schools, and workplaces.

Visual alerts act as an important supplement to auditory alarms, creating a multi-sensory warning system that addresses various needs. This is crucial in ensuring that all occupants can respond promptly and safely during an emergency situation, thereby reducing the risk of harm.