The Dogtra E-FENCE 3500 is a rechargeable, effective, hardwired underground containment system for mild to stubborn dispositioned dogs. This easy to install system allows you to set custom boundaries around your property that allows your dog to have freedom and the ability to play safely in your own yard. The E-FENCE 3500 system comes with 500 feet of 20 gauge wire and additional wire can be purchased to cover up to 40 acres. Maintaining the system is made easy with the Boundary Wire Continuity Light, where the light turns off and the transmitter makes a warning beep for any disconnected wire. Our water-resistant transmitter is designed with a Field Width adjustment knob to increase or decrease the width of signal to adjust the area where the receiver first activates from the wire, depending on your property layout and size. The transmitter includes two correction modes: High Performance Pager vibration warning before stimulation and a High Performance Pager vibration only mode. With 8 levels of adjustable correction modes, the system will accommodate to each dog’s different personality and temperament to stay within the containment area. The receiver has a battery life indicator and has 2-hour rapid charge lithium polymer batteries. EF-3500 Manual EF-3500 Training Book EF-3500 Installation How-To