I was originally looking for a bell to hang by the door for my dog. After reading all the reviews for the Tell Bell and all the reviews for the Koolatron pet doorbell set, I realized I already had something that might work: the Staples Easy Button, which my wife had gotten from her employer. It works basically the same way as the other products; it just says "that was easy" when my dog steps on it, is battery powered and does not require a transmitter/receiver. It also has 4 rubber feet on the bottom, which helps it stay in place on our tile floor. My 11 week old Airedale Terrier puppy, after a few minutes of "clicker training" (books, videos and clickers also available on Amazon) learned to use it today. Granted, that probably wasn't how the other products instruction manuals suggested training your dog, but it seems to have worked for us. Now to get him to figure out to only step on the button when he needs out to do his business, not just for fun and treats! I think he'll get it in no time. If you're really enterprising and would like to customize what the recording says, I also found a great web site that gives step-by-step instructions on how to record your own ("gotta go, gotta go," "Rover needs out," "Oo, oo, oo," or whatever). See [...]. Not only does it help prevent "accidents," it's hilarious.