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The claim. Rex Plus is the "Electronic Watchdog That Never Sleeps." You put this little box behind a partition (door, wall, curtain) and it detects movement on the other side, playing one of three sounds in response: a barking dog (described as "ferocious attack dog"), a barking dog followed by a siren, or rainforest noise (bird, frog, running water). When the motion stops, the sound stops, but it resumes if the motion does. You can also choose to have Rex play a continuous rainforest sound (perhaps to soothe nerves after the hubbub above). Rex is sold for about $80 at various online stores.
The check. We tested the device by sneaking up on it from behind a wooden door, a plaster wall, and a steel door.
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