Breakthrough in wallplate design-provides form and function with sleek lines and a curved temperature readout display - - with every attention to detail. Protective lens over the LCD, easy to read 5/8" display. Long-lasting battery that replaces from a hidden front door. Never a need to take the plate off the wall again to change the battery! Constructed using color-matched U.L. rated plastic - matches your existing switches perfectly. Plate Pals™ wallplate thermometers install in minutes and require no wiring. Ideal for children's rooms and baths. Digitally accurate to within 1 degree, they monitor the temperature in any room. Engineered in the USA by a 100 year company specializing in temperature control systems.