This set comes with a plush, a mat and a recordable heartbeat simulator. This toy is great for curing separation anxiety and crate training, because the soothing heartbeat from the simulator and the soft, warm plush and mat will keep the puppies companies, helping them to stay calm. What sets our heartbeat toy from others, is that our simulator can also record voices. If there is anything you would like your puppies to hear, you can record for up to 15 seconds, and the voice will be replayed for every 5 minutes. The heartbeat turns off every 30 minutes, but it will go back alive immediate when it is pressed again. There is no need to take the heartbeat out of the plush again to press it, simply press the plush at the right spot will also cause enough pressure to reactivate the simulator.