Title: Bark stop ... NOT
Review: It appears that the Lentek design (PC16) is related to the Viatek products (Bark Stop Pro ; ASIN: B0007TLYPO) - they are based on a common design by a Lentek engineer. I have used (tried) the Viatek Bark Stop Pro and it definitely DOES NOT work. My experience was the same as another reviewer here who noted that the unit only works on the "Audible" setting - dogs will at least perk up their ears at the high pitch tone ; they completely ignore whatever is emitted on the "Ultrasonic" setting. Furthermore, it is often activated by extraneous noises like birds, banging doors, wind noise, etc.This really poor functionality is due to either poor design or poor construction / quality. I've tried two different units and they both do NOT work.The negative reenforcement concept could work if only these devices were tuned to the noise environment and could filter out all except the actual barks.
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