Highlights: When water flows down, the LED will light instantly & automatically. When water temperature is ≤32 celsius Green color will show automatically. When water temperature is between 33~41 celsius Blue color will show automatically. When water temperature is between 42-45 celsius Red color will show automatically. When water temperature is above 46 celsius Red color will flash automatically Color light turn on automatically Temperature detectable for child & elderly safety No batteries require Easy Installation, Fix for your existing hose Specification: Function Mode: On/ Off Dimensions (Cm): 8 x 8 x 20.9 Shipping Weight (Kg): 0.2651 Package Contents:1 x RGB