There are two available accessories that can be used to extend the locator’s boundary warnings:
The first is an External Alarm Unit. This small, battery powered unit plugs into the locator and generates a very loud alarm siren that will wake you up or can be heard throughout the house or even in the nearby garage or yard.
Secondly, there is an available Phone Dialer accessory that can, though a land line connection, call up to 4 phone numbers and deliver a voice message that you record if any monitored pet wanders. These 4 numbers can include cell phones, office phones, neighbors, etc.