High Tech Pet Electronic Pet Containment Systems Ultra-advanced technology at a value price providing secure, reliable and humane dog containment Uses proprietary technology to automatically adjust stimulus intensity based on distance from boundary, keeping pet contained without overstimulation RC-7 radio collar is fully waterproof and comes with an attractive, yet ultra-tough poly-elastomeric strap Transmitter features a 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 field width