7 colors are mixed displayed automatically when water flow. Automatically change one color every 2~5 seconds. No batteries, no wire needed. LED light will light up when you turn on the tap. A Perfect Gift - As a toy, it entertains the kids. Kids will wash there hands more. Great value as a bit of fun for children and they love them. Gasps of wonderment and giggles of delight every time they turn on the tap. Adds a bit of fun and interest on a boring facility. Easy to install. If fitted it properly, it couldnt appear the water leaks or sparys everywhere. No need other power supply for auto generating electricity system. Offer you a delight & wonderful experience. Excellent Corrosion Resistance - Made of ABS material with excellent corrosion resistance. With surface precision polishingand have the nickel and chromium plating layers. Ideal for bathroom or kitchen, very fantastic. Rely on hydraulic drive generating their own power, No need for the power supply, safe and environmental. The sensitive faucet light will change colors according to the temperature of water.