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TTS is double time relay. Desired time range (shorter or longer) is chosen by the length ofpressing the trigger button switch. Holding the switch up to 2 sec. causes activation of shorter time range, above 2 sec. longer time range. This 2 sec. default limit can be changed by potentiometer (1-10 sec.). Shorter switching time range can be set between 0,5 and 5 minutes, longer 3 to 30 minutes. Relay is advisable as automatic staircase switch for switching on the lights. Number of parallel connected switches is not limited even if they use glow-lamp as the indicator.