Dog Doorbell: Easy to use and inconspicuous (what will the neighbors think?), this device allows pets to signal when they wish to go outside by stepping on the “paw” to ring the wall- or stand-mounted chime. The device uses radio frequency to transmit from paw to chime. Any size dog can activate the device, and the chime can be set for doorbell tone or a natural-sounding bark (because we can’t have your dog barking for themselves). Multiple paws can be distributed around the home at various pet exits. The chime operates on three AA batteries (included: that’s what you get for 29.95) and the paw operates on a 9-volt battery (included). Battery power provides up to 10,000 chimes before requiring replacement. Includes instructions on how to train a dog to use the device. (Well, hot damn, it’s not self-training? What kinda deal is this?) Not recommended for use outside in inclement weather. (If Sparky is outside in the rain, he’s S.O.L.) If it’s so easy to train a dog to step on a tiny “paw,” so you will hear the “bark” of a dog, and open the door… why can’t you train the damned thing to bark on its own? What’s that sound? Oh, nevermind, it’s just the dog again.