Aetertek AT-216F Owner's Manual page 10

Training the dogs to stay inside the control zone:
Set the transmission level, test the receiver based on reference distance range; when it is
near the periphery, the red LED starts flashing; the closer to the periphery, the faster the
beep sound will be made, and then triggers the vibration; if the pet is near the boundary
even further, the electric shock will be discharged. If the pet returns to the control zone,
corrections will stop. Place the flags where the warning is sent, which will set a boundary
of the control zone with all the warning spots flagged. Dogs will learn to respond after
training. Please be advised the actual range may differ from theoretical range. User should
adjust the emission level based on actual environment as wireless signals may be affected
by environmental factors. Therefore it is not unusual if the displayed distance differs to
some extend from the actual distance in some surroundings.
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