1.This product has mini built-in generating electricity devices, no need of batteries, as long as the water flow it will give out light, turn off the water, the light goes out immediately. The color changes according to the water temperature.2.When water flow,the sensor will light,the water color depends on the water temperature.3.The product has excellent water conservation function, and connected at the top with the water-saving filter.4.The product is externally threaded connector with internally threaded adapter. Adapter can make the product suitable for a variety of faucet interface.5.LED emitting color: Green, Red & Blue .Internal diameter: 0.6 inch. External thread diameter: 0.86 inch. Item size: 1.4*0.95*0.95 inchProduct Specifications:Case material: ABSLED emitting color: Green, Red & BlueInternal diameter: 0.6 inchExternal thread diameter: 0.86 inchItem size: 1.4 * 0.95 * 0.95 inchPackage included:1 x LED light faucet1 x connectorTrouble shooting steps: If The water pressure is too low, clean or replace the aerator. If Water is leaking from the faucet under the sink, check the water supply connections to the faucet.If LED does not illuminate, check the plug connection.Option Details:red: single color, as long as the water flow it will give out light in Red color, turn off the water, the light goes out immediately.green: single color, as long as the water flow it will give out light in Green color, turn off the water, the light goes out immediately.blue: single color, as long as the water flow it will give out light in Blue color, turn off the water, the light goes out immediately.multi-color: 3 colors. Changes color with temperature. When the water temperature is below or equal to 32 degrees Celsius, it freely changes to blue. Green when the water temperature is between 33-40 degrees Celsius. Red when the water temperature is between 41 and 45 degrees Celsius. When the water temperature exceeds 45 degrees Celsius, the red light flashes.