Features: Made of zinc alloy material, and advanced plating technique, which is anticorrosion and wear-resistingsafe and eco-friendly, durable and sturdy to use. Hidden mechanical keyhole, can unlock the door in emergency, not easy to be found by others, more safe. Fake locking alarm function, when the door is not locked well, the lock will alarm. Low voltage alarm fuction, if the voltage is insufficient, the lock will alarm. Suitable for metal door, wooden door and stainless steel door. Master Card: Setting and clear the effective opening card; unlock the door. Opening Card: Unlocking the door; set the stay-open state. Specification: Suitable for 125KHz ID Card , not compatible for IC / mifare card. Material: Stainless Steel. Size: Approx. 240 x 78mm/9.45 x 3.07''. Induction operating frequency: 125Khz. Applicable Card: T5557/T556EM4305. Voltage: 6V DC, 4 x 1.5V Alkaline Batteries(Not Included). Alarm Voltage: 15V, it still ensures the information not lost and stable work under the condition of strong static interference. Memory: 880 Transactions include Time/Date/Card ID/Card type/Room ID. Initialization: Unlocking the door by mechanical key for 5 times continuously will clear all of the records in the lock. Setting cards: 1. Setting the master card: After initialization, the first card to be swiped in the sensor area would be set as the master card. 2. Setting opening cards: After swiping the master card in the sensor area, take it away and swipe the card you want to set as the opening card. Then this opening card is set successfully. If more opening cards needed for this lock, please repeat this procedure. 200 cards(including the master card) at most are available now. If more cards are required, please inform us before placing your order. 3. Clearing all of the opening cards: Unlocking the door by mechanical key for 5 times continuously will clear all of the cards for the lock (including the master card), which will also initialize the lock. Or swiping the master card in the sensor area for 5 times continuously will clear all of the opening card. Package Included: 1 x Digital Card Lock. 1 x Master Card. 4 x Guest Cards. 2 x Keys. 1 x Fitting Screw Kit. 1 x User Manual