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The term "PDI" refers to Pre-Delivery Inspection, which involves checking specific elements to ensure that a device is in proper working condition. In the context of an Automated External Defibrillator (AED), the essential features that require regular checks typically include stowage, quantity, and indicator lights, such as a green light that flashes at regular intervals to indicate that the device is functional and ready for use.

Stowage ensures that the AED is securely stored and easily accessible in an emergency. The quantity refers to the number of AEDs available in a given location, which is crucial for ensuring that there are enough units at hand to respond to emergencies. The green light flashing every 5-10 seconds serves as an important indication of the AED's operational status, providing reassurance that the device has adequate power and is ready for immediate use.

The other options present elements that are either not specific to PDIs of an AED or focus on aspects unrelated to the essential operational checks for this life-saving equipment. For instance, the control unit and user guide, mentioned in another option, play roles in the overall functionality of the device but are not the key indicators focused on during a pre-delivery inspection. Similarly, weight, size, and color coding pert