Wireless Fence for Dogs - Rechargeable and Waterproof Shock Collar - Electric Pet Fence for Stubborn Dogs - Large Coverage Area up to 5 Acres - 100% Safe Pet Wireless Containment System (1 Dog)

The instructions are extremely unclear. Collars wouldn't sync with transmitter, at all. Dogs got zapped within the desired perimeter, including inside our home. We will try this again, but at this point we're planning to return this product for refund.

It says for up to five Acres but barely does any at all you get more than 35-40 feet away from controller it already starts to shock