Built-in 15 RGB LED emitters. No battery needed; Visually displays current water temperature; LED color changes according to water temperature. LED light is activated when the faucet senses water flow. Mode: Green: When the water>50'C be careful to avoid being burned red flashing prompt. Service lifetime: > 6000 hours. Environmental friendly and energy saving. Stylish and durable Easy installation. Round top shower the water flow evenly. Clean the surface regularly with water and wipe with a soft cloth. For difficult stains or spots use a mild detergent or colorless glass cleaner. Give yourself a gift with this stylish shower head and to give your bathroom decor a modern update. Note: The shower head product is selling without showerhead arm.