Petsafe Stubborn Dog Add-A-Dog® Extra Receiver Collar - Manual (Page 8)

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The Receiver Collar will emit a Warning Tone and vibrate whenever your pet enters
the Warning Zone, no matter what correction level the Receiver is set to. If your pet
continues into the Correction Zone, and the Receiver Collar is set to level 2 or above,
he will receive a Static Correction. The Receiver Collar is equipped to automatically
increase the level of Static Correction the longer your pet remains in the Static
Correction Zone if the Receiver is set at level 2 or above.
The Receiver Indicator Light acts as a low battery indicator, fl ashing every 5 seconds
when battery replacement is required. Test your Receiver Collar at least once a month to
verify that it is functioning properly and that it activates at the Boundary Wire.
Over Correction Protection
In the unlikely event that your pet “freezes” in the Static Correction Zone, this feature
limits the static correction duration to a maximum of 30 seconds. While the system
locks out further static correction, the warning tone will continue until the pet leaves the
Static Correction Zone.