A 3Vt system draws significantly less current than its 5V or 12V predecessors. This efficiency allows the scanner to run on standard rechargeable lithium-ion battery packs—the same technology found in power tools or laptops. This eliminates the tether to a wall outlet, bringing the scanner to the patient, rather than the patient to the scanner.

Medical devices often run on 3V (two AA batteries). A "portable 3V BP monitor" bought online might be the true intent.

"You brought it back sooner than I expected," the woman said without surprise. Her voice matched the low hum of the Line.

(Does it provide power, hold water, or connect a hose?)

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