- The device harvests its from the water , Quick and easy installation without any tools. fits with handheld showerhead. Materials approved for drinking water. High- temperature sensor - 360°rotatable waterproof led screen for better viewing. The LED Digital Shower Thermometer can give people a real time monitor of the shower temperature. It is self powered, mainly comprises a hydro power generator, a thermal sensor, and a digital LED display. With this device, you can easily monitor the real time water temperature, and take a more enjoyable shower. As home essential Needed - to serve and surprise your husband, wife or kids. (Especially for families having toddlers or babies) Elegant and sleek design - premium quality even fit to all hotels level.