I purchased two of these temp display units for my new renovated bathroom and Im very pleased with them and the way they work...easy to install and dont need batteries...they take the guess work out of knowing the water temp...they give me peace of mind and provide a visual of the water temp from the shower head which in turn provides safety for anyone showering...a very good idea which I highly recommend for any ones shower or bath taps....easy to install and look very modern...great idea...Thankyou crazy sales...