Features: No drilling, indoor installation,concealed installation and no marks outdoors. Outdoor card swiping unlocking, mobile app unlocking. Indoor one clicks unlocking, manual knob unlocking. The door automatically lock when closed. This intelligent door lock boasts advanced encryption with antipeep keypad, remote app control, and break in detection to ensure your home stays protect. For front door in residential homes, apartments, or rental properties, providing peacing of mind with its robusts metal construction and weather resistant performances. Specifications: Component:Metal Size:As Picture Shown Batteries are not included Package Includes: 1pcs Intelligent Door Lock note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual coloring of the item. Thanks for your understandings.