Features: The automatic pet drinking fountain is a smart way of ensuring your pets always have fresh, filtered water throughout the day and night, using clever light sensor technology. Keep your furry friends happy with this help of this handy device. How it works - using light sensor technology, the fountain can adjust the frequency of the water between day and night to make sure every drink your cat or dog takes is fresh. Water circulates constantly in a W-shaped route through a screen tray, where a microscopic hole cotton strainer, activated carbon filter and ion exchange resin will bring back clean water. Contains: 1 x drinking fountain with filter and power adaptor: 15.5cm x 18cm x 18cm 1 x filter tray 5 x filters 1 x power cable (length): 148cm