During operation, which indicator confirms correct pump operation?

• A. No indicator
• B. Alternating set of 2 icons
• C. Audible chime
• D. Single amber LED

Answer: (B)

Recognizing when a device is actively operating relies on a status indicator that communicates ongoing activity rather than a static state. An alternating set of two icons provides a clear, dynamic signal that the pump is in motion and functioning normally, visible at a glance. If there were no indicator, you wouldn’t have a visible confirmation of operation. An audible chime might indicate an alert or condition requiring attention, not smooth running. A single amber LED is typically used to signal a fault, warning, or standby state, not active operation. So the alternating two-icons pattern is the best cue that the pump is operating correctly.