I bought them due to the fact that the range of 300 meters was indicated. Communication is lost between adapters after a voltage surge of + -20 volts. With its pros: They worked at a distance of 80 meters from each other. In the city of Hong Kong, they work without problems. But in the area where there are power surges, the adapters lose each other after the power surge. Cons below: Demanding stable voltage. Get hot Occupies an outlet. The cost is too high.
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