Timers switch a contact on or off at set times. They help to implement energy-saving measures. The DTSW Astro 1 digital timer with astronomical updating is optimized for controlling electrical systems that require solar reference parameters. It can, for example, switch on or off at sunrise and sunset. The timer has a series of functions that make handling and operation easier. These include automatic switching between summer and standard time, holiday program, adjustable screen brightness and multilingual menus. Up to 40 actions can be programmed. Features: menu-driven programming, universal timer programs, such as. B. Sunrise, sunset, hourly program, daily program, weekly program, holiday program, 40 program memories, very high power reserves (48 hours without battery and mains connection, 10 years with battery) 2 changeover contacts, 16 A / 250 V AC, operating voltage: 230 V AC, compact dimensions, mounting type: quick attachment to mounting rail, installation position as desired, areas of application: time switches for time-dependent control of any electrical consumers in private, commercial or industrial applications. Notes: This device contains a battery which must be removed before disposal of the device and disposed of separately in suitable containers.