#receiver transmitter

weird tails Wireless Doorbell, Dog Bells for Potty Training IP55 Waterproof Doorbell Chime Operating at 950 Feet with 55 Melodies 5 Volume Levels LED Flash

ChunHee Dog Bell for Potty Training Wireless Doggie Door Bell for Dog Puppy Training Sliding Door/Go Outside Doorbell and Waterproof Touch Button, 1 Receiver + 2 Transmitter

ChunHee Dog Doorbell for Potty Training Wireless Training Door Bells for Dog Cat Puppy, 3 Waterproof Touch Buttons, Dog Doorbells for More Puppies 1 Receiver & 3 Transmitter