... : Zinc;Signal output: Dry contact, max rating of contact current 3AAdvantage:Easy to install, no frame door can choose bracket to use;With dual voltage ... (reader, exit button, intercom);Easy to install, no frame door can choose bracket to use;With dual voltage of 12V&24V,which can ... , change within 3 months because of product quality itself 180kgs double door magnetic lock with signal output