Dog Trainer" emits ultrasound with two frequencies of 25 KHz and a variable frequency of 25kHz-30kHz, which is inaudible to humans, but gives dogs an unpleasant sensation (discomfort, NOT PAIN). Dog Trainer has four working modes - "Sound", " Ultrasound", "Ultrasound + Flashing Light" and "Light / Flashing Light", each of which has a separate activation button. Besides, the "Ultrasound" and "Ultrasound + Flashing Light" modes.
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