Petsafe Rechargeable Add-A-Dog® Extra Receiver Collar - Manual (Page 21)

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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 15 seconds. After 15 seconds, the Static Correction will stop
and the Green Indicator Light will stay on for 10 seconds. The
Receiver Collar must be removed from the Static Correction Zone to
reactivate the Receiver Collar.