1Supports 4 kinds of unlocking methods, like Bluetooth APP, password, card, and key. 2Easy to install, any wooden door with an old mechanical lock can be retrofitted. 3Fully automatic intelligent password electronic indoor door lock can replace spherical lock. 4APP management is convenient and simple. Support temporary password remote unlocking, unlocking records can be queried. 54 virtual passwords are more secure, effectively preventing password from leakage. 6Cooperate with for TTLOCK gateway to realize remote unlock management (gateway needs to be purchased by yourself). 7Has the function of low battery alarm, no worry about the using time of lock.Condition: 100% Item Type: Door Lock Material: Zinc Alloy Color: Black Power Supply: 4 x AA Batteries (Not Included) Working Voltage: 4.5 - 6V APP Name: For TTLOCK Unlocking Method: APP, Password, Card, and Key Lock Center Distance: Approx.60mm/2.4in, 70mm/ 2.8in (Adjustable) Static Currency:1 x Main Unit of Door Lock1 x Secondary Unit of Door Lock1 x Lock Tongue1 x Pack of Screw Accessories1 x Installation Kit2 x Mechanical Key1 x Manual2 x Card