SWE Multicolor Bathroom 7 Colors Automatic gradual Changing Water Glow LED Light Shower Head No batteries, no wire needed. The light is activated by water pressure and turns off automatically. 7 colors are mixed displayed automatically Changing gradually when water flow. Easy to Install. The shower head fit for 20mm diameter screw slide bar. ABS chroming material, excellent corrosion resistance, durable. Brightness is such enough even no other lighting fixtures need.