Outside measurement Outside measurement of main controller for storage box 203mmíß117mmíß20mm Outside measurement of expansion controller for storage box 47mmíß107mmíß20mm Working atmosphere Temperature: 0ípc~70ípc Humidity :10 %~90%. 1 the system can connect at most 4 expantion boards which control 120 bins. 2 it can storage one anti-stress password, two administrator's passwords, three manager cards, 600 regular user cards and 6960 records. 3 you can set effective date, 3 time quantum and pin in every user card. 4 it can be set many kinds of working style: single card mode, card or code mode, card and code mode, dual card mode