Which of the following is NOT a communication device used by lifeguards?

• A. One-way radio
• B. Two-way radio
• C. Mobile phone
• D. Pager

Answer: (A)

Lifeguards rely on bidirectional communication to coordinate actions during emergencies. A one-way radio only broadcasts information and cannot receive responses, so it can’t provide the back-and-forth updates needed to confirm a rescue plan, call for backup, or receive new instructions. That limitation makes it unsuitable for lifeguard operations. In contrast, a two-way radio allows back-and-forth talk with teammates and supervisors, a mobile phone enables direct voice contact or rapid information sharing, and a pager can alert lifeguards to incidents so they can respond promptly. Because real-time listening and replying are essential for effective rescue and surveillance tasks, the one-way radio is not used.