Puppyknow Automatic Timing Heartbeat Toy It designed to your puppy comfort and reduceanxiety. Includes a timed heartbeat can calm your pet and keep away barking andwhining. Stay away from crying, loneliness, anxiety without medication. Automatic 6-hour timed heartbeat Invisible Velcropocket, easy in and easy out; 2AAA batteries (No batteriesIncluded) , up to 3 weeks of use, 6 hours each time.