Dog ownership is easier when you add an extra transmitter to your Lentek Pet Chime doggie door bell.  Then you'll know when the dog wants in as well as wants out.  This extra Paw works only for the Lentek Pet Chime Dog Door Bell (not included). Uses one 9-volt battery. Place the Paw transmitter in a location outdoors protected from weather. The best location is a covered screen porch or covered stoop.  Adding extra dog doorbell paws allows you to place one outside or at every door.