Love this system so much! I own 2 pads and plan to have more! I can use it in the house for ***** when I don’t want to go outside in the middle of the night, I also use it on the porch for the young pup that can’t make it down the stairs yet. So many uses, perfect for an apartment when you can’t get your dog to grass! This is a life saver, easy clean from your phone is just the best!