... Draw: 12V/300mA*2; 24V/150mA*2Suitable for: Wooden door, Glass door, Metal door, fireproof doorFinishes for Shell: Anodized aluminum & surface texture processing ... rating of contact current 3AAdvantage:Easy to install, no frame door can choose bracket to use;With dual voltage of 12V ... system (reader, exit button, intercom);Easy to install, no frame door can choose bracket to use;With dual voltage of 12V ...