Sylvania SA 170 is an advanced digital timer with Zip-Set Auto Sunset On Technology. It has 4 independent on/off programmable timers with 1-minute setting intervals. You can set the timer to work on weekends, weekdays, or all week, and activate the optional 5-minute countdown shut-off. The Daylight Savings Time (DST) switch makes it easy to adjust for time changes. The timer also features a manual override, random function for security, and battery backup to keep your settings safe in case of a power outage.