· ★ 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.· ★ Rely on hydraulic drive generating their own power, No need for the power supply, safe and environmental.