This extra receiver for use with PetSafe Radio Fence Pet Containment Systems features five levels of correction. This receiver can be used on a pet with any temperament. Level one is a warning tone with no correction. This is ideal for initial training and for use with very timid dogs. Level five is for use with very strong and stubborn dogs. This deluxe receiver also features a low battery warning light to let you know when the batteries need replacing. If you are looking for the smallest receiver on the market, and want the ability to use it with any pet, big or small, timid or stubborn, this is your best choice. Complete with adjustable collar, batteries and a set of both long and short probes.