VIVOSUN 2-PACK 7 Day Programmable Digital Timer Switch with 2 Outlets - Accurate & Stable, UL Listed PROFESSIONAL DESIGN,RIGOROUS TESTING:This ultra-reliable timer is designed so the power light shines faintly enough that sleeping plants wont be disturbed RUGGED OLD-SCHOOL CAMERA DESIGN:Made from extra-fortified plastic and high-quality components, the timer features two 3-prong, grounded sockets ready for use in North America CUSTOMIZE NEW PROGRAMS IN SECONDS:Set up to 8 independent ON/OFF programs in any 7-day pattern you can imagine; ON/OFF intervals are customizable down to 1 minute VIVOSUN BATTERY BACKUP:Our auto-backup function means you never lose your programs during power outages, and you can program the timer from the comfort of your chair COMPATIBILITY AND SAFETY GUARANTEED: UL listed and thoroughly controlled for quality, this timers is compatible with a wide variety of indoor systems and appliances For indoor use only After the manual override ON function is engaged, the timer must be switched to OFF before it can go into AUTO mode again.