The PetSafe In-Ground Radio Fence has been proven safe, comfortable, and effective for all pets over 8 pounds. The system works by producing a radio signal from the Fence Transmitter through up to 2800 feet of Boundary Wire. The Boundary Wire is buried or attached to a fixed object to enclose the Pet Area. You temporarily define this Pet Area with Boundary Flags for a visual aid in training your pet. Your pet wears a Receiver Collar with Contact Points that touch his neck, and, once trained, is allowed to roam freely in the Pet Area. When your pet reaches the Warning Zone, the Receiver Collar gives a warning beep. If your pet continues into the Static Correction Zone, a safe Static Correction will be delivered through the Contact Points to get his attention until he returns to the Pet Area.Features:Covers up to 10 acres with additional wire and flagsReceiver designed for stubborn or hard to train petsFive progressive levels of correctionLow battery indicator flashes when battery gets lowTone plus vibration only mode for trainingOperating and Training GuideStep-by-Step Installation and Training DVDUltraLight Receiver with adjustable collarGeneral Info:Will transmit up to 10 acres or 2,800 feet of wireBoundary Control Switch Settings: A= Greater than 2,400, B= up to 1,300, C= 1,300-2,400 feetOne level of correctionShould be installed in a dry and protected environment Boundary wire must be copper and must be insulatedCan easily use 14-20 gauge wireBoundary Width is 20% Warning Zone and 80% Static Correction ZoneTransmitter SpecificationsHeight: 4.75″”Width: 4.25″”Depth: 2.10″”Frequency: 10.65 kHz Standard, 7kHz alternative availableFlip Up Front CoverDark Gray in ColorTwo red indicator lights (loop and power)Wir