Specification: Type: WiFi smart door lock Color: Black Panel material: aluminum alloy Lock body material: stainless steel Lock cylinder material: copper Applicable door thickness: 35-55mm/1.4~2.2inch Batteries: 4 *AA batteries (not included in the package) Size: 36.5*7.2cm packing list: Smart lock with latch x 1 IC card x 1 set Mechanical key x 2 Screw kit x 1 English manual x 1