ALEKO TS-DF23 Electronic Pet Fencing System, One Dog Provides opportunities for you to train your pet stopping undesirable behavior This electronic pet fence is designed by audible and visual wires break alarm The model is provided with speed detection anti-run through, progressive tone Can offer the freedom for your pet, stop its undesirable behavior When the pet with the receiver approaches the boundary which is covered by the radio signal, the receiver will receive it with automatically warning beep and harmless electronic stimulation to keep the pet away form the forbidden area.