EI600 Series electronic decorator astronomic time switch are easy-to-program timers that provide up to 40 events per week. Easy to program for 24-hour or 7-day load control. Auto daylight saving time adjustment (factory enabled). CFL/LED compatible. Astronomic feature provides sunset ON and sunrise OFF settings or combine Astronomic features with specific timed ON/OFF programming. Low battery indicator. Continuously displays time of day, mode and load status. CR2 lithium battery provides a minimum of 2 years of time keeping without AC power. Replaces single-pole or 3-way switches in a variety of applications. Random setting feature available to avoid predictable time controlled look. User program selections are stored in non-volatile memory. Controls all voltage/frequencies with no adjustments required. No neutral required. Manual override feature.