Description: No batteries, no wire needed. Color changes according to the temperature of the water running through it. ABS material, excellent corrosion resistance and durable. Brightness is such enough even no other lighting fixtures need. Transforming the stream of water into a beautiful waterfall of light. Features: 1. No batteries and external power supply, the light is activated by water pressure and turns off automatically with the water. 2. Mixing light and water, bring a dreamlike world. Color changes according to the temperature of the water running through it. 3. The beautiful process of RGB color changes will relieve your pressure, remove your tiredness and relax yourself. It's as if getting a wonderful experience after finishing your shower. 4. Easy to Install. The shower head fit for 20mm diameter screw slide bar. Just twist off your existing shower head and replace with the new one. 5. The water flow and circuit is separated, without any phenomenon of leakage, so it is very safe to use. Specifications: Condition: 100% Brand New and High Quality Material: ABS + Stainless Steel Color: Silver LED Emitting Color: RGB A. When water temperature is below 32℃, blue color will show automatically B. When water temperature is between 32~38℃, green color will show automatically C. When water temperature is between 39~45℃, red color will show automatically D. When water temperature is above 45℃, red color will flash immediately and simultaneously, which warns you should be careful Interface Size: Using internal thread 20mm (General Purpose Interface) Size(D x H): Approx. 20 x 2.1cm / 7.9 x 0.8inch Weight: Approx. 0.35kg Package Included: 1 x LED Light Shower head Please Note: 1. Please allow 1-3mm error due to manual measurement.Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. .