Not battery operated....
This seemed like a great option if the unit ran on rechargeable batteries.  However it only works via being plugged into an electric outlet.  Not very practical when cleaning dirty paws before they come in or just inside the doorway.  Notice the ad also....no pics of someone using with the plug to be seen.  Ours is going back.  Giving two stars because it might be very effective if your space And dog are cooperative.
Rating: 2 stars