Invisible environmental protection: The electric cord of the Pet electronics fence is buried in the ground and does not take up space or damage the appearance, providing more space for the dog to move freely. Progressive tone stimulation: When the dog approaches the Demarcation line, the system will first emit a warning sound to alert the pet, if it continues to approach the Demarcation line, the system will emit a slight vibration stimulus to help the pet learn and remember the Demarcation line. Pulse proportional stimulation: with humanized high-tech design, the vibration intensity of the electronic pet fence will be adjusted according to the distance of the dog near the Demarcation line, and the vibration intensity will gradually increase when near the Demarcation line, effectively reminding the pet not to cross the line. Built-in speed detector: The Pet electronics cage has a built-in speed detector that can adjust the intensity of vibration stimulation according to the speed of the pet's movement. The faster the pet moves, the higher the stimulation intensity, increasing the control over the fast-running pet. Wide control range: The control range of the Pet electronics fence can reach the size of a football field, and can be adjusted as needed. This gives pet owners the flexibility to set and control their pet's range according to their own environment and needs. Safe and reliable: electric pet fence built-in wire damage indicator, once the wire is damaged, the system will issue a loud alarm and flash prompt to remind the owner to repair in time. In addition, the transformer of the electronic pet fence is also equipped with a lightning protection device to effectively avoid lightning damage to the system and ensure the safety and reliability of use. Note: Take a few minutes to read the manual carefully before you use it for the first time. To achieve good results, follow the following important rules. 1. The electronic dog is only applicable to dogs. 2. Low power may cause intermittent operation. Do not use it when your battery is low. 3. Let your dog get used to the collar before you start training. You should let your dog receive the collar and treat her as a part of life. 4. Don't leave the collar receiver on your pet for more than 12 hours a day. 5, when the collar is on your dog, do not set the program randomly. 6, electronic dog is only suitable for use under the supervision of the dog owner. 7. Keep out of reach of children. 8. Please read all instructions before using this product. Package contents: 1* indoor wall transmitter. 1* Power plug. 1* Adjustable collar receiver. 6V battery in 1* collar. 1*300 m long border power cord. 2* Extra metal contacts. 20* Training markers. 1* tester. 4* screw nails. 1* User manual.