Brief:Feature Description Astronomical Switching Automatic ON/OFF control based on calculated sunrise and sunset times Built-in City Selection Quick city selection with automatic geographical coordinate setting Dual Independent Outputs Two separately programmable relay channels (A/B) 8A / 16A Options SATR-2408: 8A; SATR-2416: 16A 24 Programs Flexible astronomical and conventional time switching schedules Sunrise/Sunset Offset Adjustable switching times relative to sunrise and sunset Replaceable Battery CR2032 battery for real-time clock backup Advanced Control Manual operation, quiet mode, PIN protection and seasonal time adjustment