Features: Exquisite appearance, rational structure, safe and reliable. Very easy to operate, suitable for office, house and apartment. Change Master password and Sub passwords freely. Master password can be used to add or delete any sub password. One-Key opening function (Passage Mode) : Press any digital key to open the lock. Low battery alarming function. Package include: 1 x Door Lock 7 x Fixing screws 1 x Jamb box 1 x Strike plate 1 x Emergency power