If you have 2 dogs and are looking for an affordable way to train them then we have what you are looking for, The PetPal 500 Series 2-Dog has all the features that the 500 Series Model has but with the capability of handling 2 dogs with one transmitter, Now you can train your dogs at an affordable price without sacrificing the features that are necessary when training, 500-yard range Transmitter operates 2 individual and separate collars, 16 levels of continuous and momentary stimulation Positive vibration option Waterproof collar and remote Adjustable collar uses rechargeable Ni-MH battery Transmitter requires one 9-volt replaceable battery SKU: GVDS445