Option Description: 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. 7 Color random: 7colors,as long as the water flow it will give out light, color will flash and change randomly. 3 Color Warm Control: green, blue and red color will be changed by water temperature. Features: 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.The product has excellent water conservation function, and connected at the top with the water-saving filter 3.The product is externally threaded connector with internally threaded adapter. Adapter can make the product suitable for a variety of faucet interface 4.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 inch Product Specifications: Case material: ABS LED emitting color: see your choice Connection: M24 fits for internal and external Faucet Internal thread diameter: 0.92 inch (23.5mm) External thread diameter: 0.95 inch (24mm) Item size: 1.4 * 0.95 * 0.95 inch Package included: 1 x LED light faucet 1 x Adapter(for external fauct thread) Trouble 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.