The YoLink Water Leak Sensor Set includes 1 hub and 3 sensors, all brand new and designed by YOLINK. The water leak detectors are white in color and operate wirelessly for easy installation throughout your home. The model number for this set is YS7903-UC (detectors) and YS1603-UC (hub), providing you with a reliable monitoring system to detect any potential water leaks and ensure the safety of your home.