What safety equipment features should flight attendants be knowledgeable about?

Flight attendants must be knowledgeable about the use of life vests and oxygen masks because these items are critical safety equipment designed to protect passengers during emergencies. Understanding how to properly use this equipment ensures that flight attendants can effectively instruct passengers in emergency situations, leading to a higher likelihood of survival and overall safety on board. Familiarity with life vests allows flight attendants to demonstrate proper wear and use during water landings, while knowledge of oxygen mask operations ensures that passengers receive adequate oxygen in case of cabin depressurization. This knowledge is essential for the flight attendants' role in ensuring the safety and well-being of all passengers throughout the flight.

The other choices do not pertain to essential safety training or emergency equipment that the flight attendants need to be proficient in for ensuring passenger safety.