Features: When green light is always on, means normal working model. When blue light is always on, means intermittently model(work 3 min, then stop 2 min). When red light flashes - means water level low, can works normally. When red light is always on - means water is not enough, and the pump shuts off automatically to prevents the pump from running dry. When Green light flashing - remind replace filter. Ultra Silence Never Disturb - DADYPET cat water fountains have advanced pump,which is whisper-quiet and stays below ¡¾10 decibels¡¿. The water softly bubbles over the tower of the stainless steel cat fountain, allowing timid or shy cats to comfortably drink from the pet water dispenser. This dog fountain holds 67oz/2L large water tank. Ideal for all sorts of small pets when their owner is on a small trip. Intelligent With LED Light - Different LED models let you know the state at a glance! 1.When green light is always on, means normal working model. 2.When blue light is always on,