WIDE APPLICATIONS: This small device is suitable for most faucets that have either internal or external threads. 3 COLOR CHANGE WITH TEMPERATURE: Blue color shows when the water temperature is 32 degrees. Green color is displayed when the water temperature is between 33-41 degrees. The red color appears when the water temperature is between 42 and 45 degrees. Red color flashes when the temperature exceeds 46 degrees. PREMIUM MATERIAL: Made of ABS with excellent corrosion resistance. Ideal for bathroom or kitchen, very fantastic and durable. EASY TO INSTALL AND WATER SAVING: The led faucet faucet has water conserving function and connected at the top with the water saving filter, Convenient to use. Helps children avoid scalding water. A must have device for every home. WARM WARNING: If the water faucet LED lights up, it needs a certain water pressure. And it won't turn on if the water pressure is too low. The faucet is made of ABS, so recommend wrapping PTFE tape on the thread when installing the faucet. Be careful not to force too much during installation. (ABS material is easily broken if you force too much.)