Item NO.:  M922
Material:    stainless steel
Size:         100*40*13mm
Color:         steel
Power supply: 3pcs AA batteries
Battery life:  10-12 month.
Low voltage alarm function: voltage lower than 4.8V
External power interface: yes
Working temperature:   -20 ℃ ~ +65 ℃ 
Working humidity: less than 98%RH
Lock body material:fire rated plastic.

This lock with three-level management. 
*The first level is master card. ( only 1 master card can be programmed) 
*The second is management card and management code, maximum for card and code is 3 and 1. 
*The third level is user code, temporary code, user card or user card plus code. 
  You can only choose one from these four ways to operate.