Legrand AlphaRex³ DY21, digital year-round timer with additional astro function, 1 channel, 84 switching programs, operating voltage 230 V 50/60 Hz, program creation directly on the device or with PC, AlphaSoft, PC adapter (412873) and data key (412872). Astro function (sunsets/sunrises) can be combined with timer function. Permanent ON/OFF, random program, cycle function, 1 hour test, PIN code lock, operating hours counter, background lighting, control input, automatic summer/winter time changeover, 5 year power reserve, accuracy +/- 0.1 sec/day, shortest switching time: 1 sec, zero-crossing switching. Switching output: 1 changeover contact.