User's Guide

2.2. The animals interacting with the system
When the animal crosses the Nofence boundary, the collar starts playing an audio warning. The signal is
a scale of tones, which starts at a low pitch and rises gradually as long as the animal is outside the
Nofence boundary. If the whole scale has been played, an electric pulse is delivered. During training the
animal will turn when receiving an electric pulse to seek the safety of the herd. The animal then learns to
recognize the audio warning and turns around to avoid the electric pulse.
The illustration shows normal behavior when the animal moves out of the Nofence pasture: it responds
to the audio warning, turns, and goes back into the Nofence pasture.
The electric pulse will only be emitted if the collar has played all the tones of the audio warning. This is
because the system must be predictable and controllable for the animal. It takes a minimum of 5
Nofence AS User Guide - UK - 2021_en
Page 7 of 63