Tork® timers give you a simple way to control automation for your home or office. Multiple modes and professional-grade accuracy make this a versatile timer for many applications. Multi-purpose timer - automate and control a range of indoor or outdoor loads such as lights, heaters or air conditioners, water heaters, school warning signals or traffic lights Easy-to-use - the intuitive programming interface lets users set up to 99 different on/off times with individual programs for each day of the week and up to 24 hr holiday blocks Designed for convenience - built with features such as a 7-day power outage backup, automatic daylight savings time adjustment and Noryl® plastic enclosure with locking hasp Save energy and money - time switches save time, energy and money by providing a convenient way to turn appliances or lights on and off Professional performance - DTS100B is compatible with incandescent, compact fluorescent and LED light bulbs and automatically detects voltage in the 120 to 277 VAC range