LED digital display description: LED digital display does not require any power supply, does not require batteries, hydropower, built-in micro hydroelectric generator, water flow will display the temperature The difference between the constant temperature style (Temp) and the hot and cold style (Hot Cold), the constant temperature style (Temp) has hot and cold water to provide the case, the constant temperature style is used for the first time to adjust the temperature, and the subsequent use automatically adjusts the temperature; the hot and cold style (Hot Cold) has hot and cold water to provide the case, each use needs to manually adjust the temperature, pay attention! The shower system itself cannot produce hot water, and the water heater is required to assist in providing hot water