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PetSafe Stay & Play Compact Wireless Pet Fence for Dogs, No Wire Circular Boundary, Secure up to 3/4 Acre, No-Dig and Portable for Travel, for Dogs 5lb & up, from Parent Company Invisible Fence Brand https://a.co/d/a0rVOx8
This one works very well. After having my in ground one cut for the umpteenth time, I gave up and went wireless. This keeps my fat lab in the yard very well. It's not the super fancy one you can set up a custom border with an app, just a base station with a radius you can adjust but it works great.