Certain switching times are factory-preset for a quick start-up. A total of 9 UP and 9 DOWN switching times per day can be programmed within 3 program memory spaces. The Astro program, which factors in changing sunrise and sunset times, can reschedule the activation of the blinds by +/- 2 hours. When the random generator is used for times of absence, this becomes +/- 15 minutes. The switch to summer time or winter time is automatic.