Features: 1) Adopts the patented technology of TEMIC? from Germany 2) Excellent performance and reliability 3) Four AA alkaline batteries can work for more than one year 4) When it is in stand by position, the power consumption is less than 20mAh 5) Low voltage warning 6) Hidden high security cylinder 7) Can copy, recover, clear up and print the important data conveniently 8) TalenCa smart card management system is an interactive software with videotext interface. Each rooms status is demonstrated like a diagram so it is very clear to know the rooms status Outer packing: 6 sets/ctn Dimensions: 540 x 330 x 540mm N.W.: 3.80kg G.W.: 4.10kg Origin Nanjing Material Brass