FAQ Q:How long do batteries last on average, what type of battery does it use? A:It can be used for 1 year in average,it is 12V 23A alkaline battery. Q:Do I need power outlet outside and inside? A:The transmitter is powered by battery,It is very convenient to replace the battery and battery could last 1 year.The receiver is directly plugged in outlet and powered. Q:Is this product a button or touch screen type bell? A:It’s a sensor. Your pet just touch it is ok. Q:Is it easy to train the dog to use it? A:Yes,it's easy to train your dog how to use it. The First Step: Have your dog touch your hand nose or foot! treat! nose or foot! treat! The Second Step: Put wireless doorbells on the floor; touch with nose or foot! treat! repeat reward process. The Third Step: Use 3M double-sided tape to stick the wireless doorbell on the door or wall nose or foot! treat! The Fourth Step: repeat, open the door, and tossing the treat outside. Few rounds of repetitive and positive reinforcement. In a word,why choosing IOEN? IOEN=High Quality+Best Value+Best Service. For all IOEN products,by providing the same high quality products,we only sell 2/3. Key Feathers Best value Save 1/3 with the same quality wireless dog door bells,all of us using the same mechanism solution from same supplier. Best service Up to 1 year,much longer than other products` 90 days service policy. 55 sounds,5 volume levels Like most other bells,there are 55 sounds inside and 5 volume levels available. Long range & waterproof The long wireless range could reach to 950 feet,any corner of your house;Also IP55 waterproof design,available for any weather outdoor.