The PetSafe wireless pet containment system creates a secure circular boundary of up to 1/2 acre around your home, with no wire to bury and no fence to build. • Transmitter sits inside your home, with a dial to adjust the boundary • Sets up in 1 to 2 hours • Portable, so you can bring it camping and more • Receiver collar with a tone-only training mode Freedom to play outside, no digging required.