Built-in 12 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>50C be careful to avoid being burned oh red flashing prompt. Environmental friendly and energy saving. Stylish and durable Easy installation. Square 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.