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The harmless radio signals are transmitted by buried wire to make the system work. When the pet is close to the boundary, the transmitter can emit stimulus signals sensitively. The closer to the border, the stronger the signal will be to remind the dog to return to a safe area.
One transmitter can be used with multiple receivers at the same time.
Two sets of coils can be used at the same time, and another forbidden area is set in the big circle.

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