brand new item, open box. [Newest GPS Positioning Technologyl BHCEY GPS Wireless Dog Fence System adapts the newest GPS satellite positioning technology. It uses a GPS signal to locate the real-time location. It is much more accurate and stable compared to other traditional fences which use the radio-frequency signal. The satellite positioning technology provides much better accuracy than any other similar products and also a much larger signal range up to 3280ft. In radium [Easy to Set Up & Rechargeable) BHCEY GPS Wireless Dog Collar is easy to set up and it does not require any transmitter boxes or boundary wires to set up a boundary. You just need to set the radius and shock intensity level for the first time, then position the original point after every time you restart it. The wireless dog collar is rechargeable. It has a built-in high-capacity rechargeable battery, which can work for 15 hours after being fully charged. [Large Range & Adjustable Warning Strength] BHCEY GPS Wireless Dog Fence can cover the range up to 3280 feet in radius and the area up to a max of 776 acres The control distance can be adjusted within the range Its enables your dog to be trained outdoor with a safe boundary set. The warning strength can also be adjusted for three different levels of vibration and shock. lts adjustable warning strength will effectively train your dog for different situations while keeping your dog from harm.