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Product Description STEEL MATERIAL; 5-1/8 INCH WIDTH X 3-7/16 INCH DEPTH X 7-7/8 INCH HEIGHT SIZE; 1 HOUR MIN. OFF TIME; 1 HOUR MIN. ON TIME; UL (CANADA AND US), CSA (CANADA AND US) APPROVAL From the Manufacturer This Intermatic "Little Gray Box" electric water heater timer will provide up to 26% savings for your electric water heater. To maximize the savings, the timer should be used to operate one hour in the morning and two hours in the evening, set to turn "ON" one hour in advance of the usage periods. The trippers may be set from 1 to 23 hours. Three sets of trippers are included. It also provides a convenient external override switch. It is easy to use.