The IB-100 is a wireless Battery Operated Boundary (BOB) that you can use anywhere to create a pet-free zone. The IB-100 has a re-chargeable battery and will protect an area up to 8 feet in diameter. This is a perfect choice if you need a portable boundary that can be used without plugging it in. Our indoor pet fences work wherever you need them, quietly, effectively, and hidden from view. A harmless, noiseless FM radio signal lets you control where your pets roam in the house. The systems work with the same DogWatch® receiver collar your pet wears outside, so it is a great way to expand the value of your Hidden Fence purchase.