Help keep puppies from crying due to separation during kenneling and crating with the melodic vibration of a maternal heartbeat. K&H has designed a Mother's Heartbeat Puppy Fleece Crate Pad with a removable Mother's Heartbeat device. Maternal heartbeat speeds vary between breed sizes. Our Mother's Heartbeat devices are based on estimated heartbeats of the breed of the parents and puppy. Included device installs into the pocket at the front of the crate pad. The Mother's Heartbeat Puppy Water-Resistant Crate Pad by K&H has all of the same features as the fleece version, however it comes in a water-resistant polyester fabric. This fabric's water-resistant feature can help come in handy for accidental wetting in the crate. The melodic sound of the heartbeat device helps puppies during separation. It's removable and easy to install into the pocket at the front of the crate pad. One year limited warranty.