*Waterproof smart dog underground pet fence system, new smart dog underground pet fence system, with waterproof collar, pet products, pet fence, the most reliable and cost-effective pet enclosure system.*Buried line transmits harmless radius signal. When your dog approaches the border, this signal causes the dog's collar receiver to emit a warning buzzer first. If your dog continues to approach the border, the system will vibrate slightly. If your dog continues to walk, the system will emit a stronger vibration until your god returns to the boundary you set. Your dog will naturally seek to avoid correction, and his satisfaction stays within the established rangemain feature: 1. Pulse proportional stimulation2. Progressive tone stimulation3. Variable field width control4. Audio and visual disconnection indicator5. Speed ​​detection anti-run through6. Built-in lightning protection7, multiple necklines8. The maximum water meter range of 5000 square meters (more than 1.2 acres)package:1 indoor wall-mounted transmitter;1 x power plug1/2/3 adjustable rechargeable receiver collar;1 x USB cable;1 x 300m boundary line;2 additional metal contacts;20 x training flags;1 test bulb;2 screws;