Improves the pre-load characteristic in direct current operation to a minimum of 300N. A short humming noise at the door opener will be audible for about 0.5 seconds. Continuous current resistant, hol
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Improves the pre-load characteristic in direct current operation to a minimum of 300N. A short humming noise at the door opener will be audible for about 0.5 seconds. Continuous current resistant, holding current is reduced. Compatible with common effeff door openers.