SUITABLE FOR ALL DOGS - Our wireless doorbells work with any size of pup. Our doggie doorbell and training bells are useful for training dogs of any age but are really successful as potty training bells for puppies between 8-12 weeks old. WATERPROOF & LONG RANGE- The dog training bell with IP55 waterproof grade, which can be used indoors and outdoors. The receiver and transmitter's working distance can reach 500ft in a barrier-free environment. NO MORE BARKING - Say goodbye to barking and hello to the soothing sound of a doorbell. The wireless pet bell is pushed with your dog's nose or a paw to alert you when they want to go outside or come inside. Your pet will learn fast and stop barking to communicate their needs. HEAR RINGTONE EVERYWHERE -This wireless dog doorbell includes 1 receiver and 1 transmitter. The receiver is equipped with 55 kinds of ringtones of different styles for your choice. 5 levels of volume adjustable, from silent to noisy(0 db to110 db). Also has a memory function that will remember your last doorbell ring after a power outage. EASY INSTALLATION - Just plug the receiver into the outlet in the bedroom/living room/kitchen/garage. Use the tape to stick the transmitter on the door/floor/wall, even on a board anywhere you need it.