SYLVANIA SA400 Single Pole, Single Throw Digital Industrial Time Switch with Zip-Set feature for One-Step Set-UP controls residential and commercial lighting. Selectable voltage 120V or 277V. Saves you time and worry by automatically controlling lighting, pool filters, heaters, signage, and more. By simply entering your area code, you can set the Time Switch to automatically turn on lights at sunset and adjust for seasonal time changes. Additional options for random or programmable settings, as well as a manual control option, make this switch easily customizable to meet your needs. Just set it and forget it-no trippers to mess with, and no readjustments necessary.Sylvania SA400 Single Pole Single Throw Digital Industrial Time Switch Features:; Industrial time switch; Digital control saves time and maintenance, eliminates mechanical noise, eliminates lost trippers, maintains to the minute programming; Controls pools, spas, fountains, electric water heater, office commercial lighting, outdoor lighting and signage; Unbreakable tamperproof housing eliminates vandalism; Heavy duty all metal construction housing; Set-up confirmation beep; 7-5-2 feature allows you to set times based on the 7 day full week, 5 day work week, or 2 day weekend; Large illuminated digital display and keypad; Battery back up saves resetting time in the event of a power failure; Batteries included. Indoor Installation. Programming assistance is available through our toll free customer service department 1-888-548-4484. Rated ETL/CUS 120/277V, 30A, 4,800W Do not exceed rated capacity.