Technical parameter of anlok card lock ned by pushing down the handle once, if delay to pen the door, lock resets automatically after 6 seconds. Low voltage warning: as the voltage is lower than 4.8v, warns appear when unlock the door with the sensitive card, but it still can open the door 100 times Lock-fail warning: if the door is not locked (in the un-latched state), it will alarm after 3 seconds Data query: it can store maximum 338 unlocking record, including unlocked record by mechanical keys Door thickness: 38-80mm (please specify if the thickness is over 55mm), best thickness for installation is 45mm. 10pcs in a big carton