specially for apartment
Material: Alloy Zinc
Color: Peony Golden & Silver
Undervoltage alarm: 4.4V±0.2V
Operating frequency: *3.*6MHz
Size: **6**7***0mm
Weight:***0G
Door thickness: *0 to *0 mm
Standard Voltage: DC6V, 4 pcs of AAA Dry Cell
Don\'t need USB card issuer, don\'t need to install software