It only tells you if there are people inside, either moving or breathing, and how far away they are. There's only text output, no actual images.
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From the manual: "RANGE-R is designed for simple one-handed operation. Holding RANGE-R to a wall, door or other building structure, the operator simultaneously presses buttons on the sensor’s two sides to begin the analysis. Within three seconds, the system returns a range-to-target result as well as the status of the target, which is indicated as either a mover (Mov) or a breather (Br). The result is displayed to the user in terms of distance in feet to the target on the unit’s LCD. RANGE-R is also capable of detecting and displaying the range of multiple targets. In such cases, the display will alternate through the different ranges of the targets."
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From the manual: "RANGE-R is designed for simple one-handed operation. Holding RANGE-R to a wall, door or other building structure, the operator simultaneously presses buttons on the sensor’s two sides to begin the analysis. Within three seconds, the system returns a range-to-target result as well as the status of the target, which is indicated as either a mover (Mov) or a breather (Br). The result is displayed to the user in terms of distance in feet to the target on the unit’s LCD. RANGE-R is also capable of detecting and displaying the range of multiple targets. In such cases, the display will alternate through the different ranges of the targets."