Smart Sensor Automatic Pet FountainThe Smart Sensor Automatic Pet Fountain is an innovative way to keep your pets hydrated. It automatically fills the bowl with water when it detects that your pet has already been drinking from the fountain and will stop filling after a set amount of time, so you don't have to worry about over filling or running out of water. Optional Sensor Function: Energy saving. Extend the fountain lifespan. When your pet is approaching, it will operate