The PetSafe PWF00-11923 Pawz Away Outdoor Pet Barrier is designed to keep you pets out of "off limits," areas in your yard or garden. The Pawz Away system looks like a rock so it will seamlessly blend in with any landscape. When your pet enters the barrier area the rock transmitter will send an spherical radio signal to the receiver collar, which will emit a safe, progressive static correction that will startle your pet and keep them out of the off-limits area. This static correction is safe and will cause no harm to your pet. Your pet will quickly associate the unpleasant correction with the barrier area. The PetSafe Pawz Away outdoor pet barrier system can be used on pets over 5 lbs.