... at the same time),and you can get double benefit from it.This product have record function ... and marked below the button ) 1.Original password:Press1, 2 , 3, 4 sequentially.2.Work record (record number of times) ... machine. red color), input four passwords (1,2,3,4 )reveal working number of times A and B ... The red color), input four old passwords 1, 2, 3, 4 ,then input four new passwords, confirm the four ...