Item VS-LO539OB IC card spec Technical SLE4442 sensor from Siemens, meet ISO7816 standard Craft Insert the electronics module into the PVC surface System logic 32 bytes encrypt protect Storage 256 bytes ROM Reading Insert the card into the lock Reading Characteristic Read, write and encrypt Lock Spec Working power 4pcs No 5 batteries, DC6V Static current less than 12mA Dynamic current 120~150mA Battery life more than 12,000 times Low voltage warning When CPU working voltage is less 4.8V, the lock can still be opened dozens of times before the batteries are replaced Emergency unlocking The door can be opened even if the deadbolt works Reliability the mistake rate is less than 0.1% Unlock record built-in “black casket”, inside with 864pcs latest unlocking record, Mechanical key unlock the door could be recorded Guarantee cost The lock could be working even if it have been touched with invalid card Mechanical key The separate emergency mechanical structure will allow the opening by the mechanical key in emergency. Installation requirement the thickness of door should be more than 35mm.