Wireless fence electronic containment system. With no wire to bury， the containment system is set up in minutes. Uses a constant radio signal to create a safe zone. When your pet attempts to leave the area， he receives a warning tone， if he continues a mild correction is given. The signal field can be adjusted anywhere from a 10-foot to 90-foot radius from the transmitter. Ideal to use on a medium to large size dog. Automatic shut-off， low battery indicator， expandable containment size， adjustable waterproof collar. System includes: 1 transmitter， 1 receiver， 50 boundary flags， 1 video， and 1 manual for installation and training.