The idea of dog door bells is for training your dog to learn to touch the button when they want to go outside or inside instead of scratching barking and whining. Trigger simple-The dog doorbell is easy to activate. Just need to lightly touch or slip over the touchpad with nose or claw. Easy Installation -Dog doorbells for potty training are wireless. Use 3M double-sided tape to stick the transmitter on the door/floor/wall, even on a board and then you can place it any where you need. Flexibly increase or decrease the receiver and transmitter according to your needs. Just plug the receiver into a socket for the plug-in Receiver .The matching method is simple and easy to operate.