Polite Pet Ultrasonic No Bark Dog Collar Humane method-operates with Ultrasonic tones or your own audio commands Triggered by your pet only. Ultrasonic, audio or Ultrasonic & audio modes. Adjustable collar fits 4"-22" necks. Uses (4) replaceable 1.5v batteries (included) Small & lightweight design. Water resistant. Limited lifetime warranty. Comes with manual. Send a photo of your pet modeling this collar to gainkeeper@gmail.com. It may be selected as pet-of-the-month & featured on my Amazon ad.