Please mention that the color will be changed with the change of the water temperature.As follow description:1.When the water temperature below 31 degree centigrade，the light will be "green" light.2.When the water temperature between 33-41 degree centigrade，it will emit"blue" light.3.When the water temperature between 42-45 degree centigrade， it will emit "red" light. 4.When the water temperature higher than 46 degree centigrade，the red light will blink.Type:Bathroom Faucet AccessoriesBathroom Faucet Spout Feature:Without DiverterSurface Finishing:NickleMaterial:ABS Plastic Direction for use:Firstly， take off net from tap screw thread.Secondly， install LED faucet light screw thread.Thirdly， usage of adapter screw thread inside universal adapter.This little device fits on most taps and lights up a set of LEDs when you turn on the tap.The light is activated by water pressure and turns off automatically without the water.