Our Calmeroos replacement heart produces a comforting heartbeat and can be used in any of our Calmeroos plush products. An easy on/off toggle switch allows you to control when you want to use the heart to comfort your pet. Includes 2-AAA batteries and will last 3 weeks when used continuously! Perfect pets who loves to cuddle up to a comforting heartbeat! A very soothing heartbeat toy for puppies, kittens, dogs, cats! Please note, this listing does not include a plush.