... .Work stable; 3.Low battery alarm; 4.Low energy consumption High quality hotel room card lock system DH8015-Y Mifare card door lock ... by zink alloy(stainless steel or copper) once, with high securicty and solidty nature.2,Intellectual ultrathin little core of lock,This ... , you will finish setting up the hotel lock easily..and in the reception of hotel, the hotel staff will make the room card for ...