4-channel annual time switch, RC: Time synchronisation by connecting an external DCF or GPS antenna (with GPS additionally position determination for Astro programme), 4-channel extension module (EM 4 top2) and LAN module (EM LAN top2) can be connected, Modular housing, Width 4 TE, Year and Astro programme, Interface for OBELISK top2 memory card (PC programming), OBELISK memory card included in delivery, 6-year power reserve (lithium battery), Automatic summer/winter time changeover, ON-OFF switching times, Pulse programme, Cycle programme, Extensive annual clock functions, Astronomical switching function (automatic calculation of sunrise and sunset times for the whole year), Astro offset, Astro pulse, Circuit preselection, Continuous ON/OFF switching, Expiry timer, Integrated operating hours counter, External push-button/switch input, Holiday programme, 2 random programmes, Display lighting (can be switched off), PIN coding, Zero-crossing circuit, DuoFix spring-loaded terminals for 2 conductors each