Easy Installation: 1/2-inch nut, compatible with most shower heads, easy to install without tools. With this thermometer, we can shower at the perfect water temperature, especially suitable for families with children. No Batteries Required: Built-in small-scale hydroelectric system to generate power, no batteries required or risk of power leakage. Automatically shuts off when there is no water flow. Memory Function: The screen also displays indicator lights (blue/green/red) to help you choose the appropriate water temperature. Built-in memory chip allows you to track bath time (up to 99 hours and 59 minutes). High-Precision Monitor: Built-in high-precision temperature sensor provides a measurement range of 0 to 100°C and an accuracy of ±0.5°C. Selectable Celsius/Fahrenheit display. 360°C LED temperature display: A clear LED screen allows you to monitor the shower temperature in real time. 360° rotation for better viewing.