The Humane Contain Advanced Electronic Dog Fence Super System brings you ultra-advanced technology at a value price providing secure, reliable and humane dog containment. The revolutionary Pulsed Proportional Stimulus System delivers sound and shock stimulus based upon your pet"s exact distance from the boundary wire. Competing systems sometimes deliver too much or too little stimulus. But with the HC-7000, stimulus bursts come faster as your pet moves closer to the boundary allowing your pet to decide how much stimulus is required to initiate retreat behavior for the most effective, humane and reliable containment. The included ultra-slim RC-7 radio collar is fully waterproof and comes with an attractive, yet ultra-tough poly-elastomeric strap. The state-of-the-art TX-7 transmitter features an all digital, coded signal to eliminate false triggers and includes both audible and visual wire break alarms. Current-controlled power lets you add enough wire to enclose up to 30 acres while maintaining precise control of your field width (sometimes a problem with inferior systems). Custom engineered, Ultra-Wire is thicker overall and stronger than even heavy duty 18-gauge burial-grade wire. Its special high-strength coating is resistant to sunlight, moisture and ground rot. Its extremely high pull-strength resists wire breaks. Kit includes TX-7 transmitter, RC-7 receiver collar, 500-feet Ultra-Wire, 50 boundary flags and 5 wire splices.