Features: 1.4 in 1: Keyless entry smart lock, with 4 ways to unlock, such as fingerprint, password, mechanical keys and for TTLOCK app, high securitity, anti peeping, more convenient for using. 2.Fingerprint Unlock: Smart fingerprint lock can identify fingerprints within 1.5 seconds and store up to 50 fingerprints, the error recognition rate is low, the recognition speed is fast. 3.Low Battery Reminder: Smart lock with low power consumption, requires 4 AAA batteries(not included), low battery reminder, equipped with USB interface for emergency charging. 4.Bluetooth APP Control: Support for Android 4.3, for IOS 7.0 and above, bluetooth door knob supports for TTLOCK app, remote control your door, share temporary passwords and dynamic passwords. 5.Easy Installation: Fingerprint door lock is designed to fit door thicknesses from 35?65mm/1.38?2.56in. No wiring and no drilling. Fit both left handed and right handed doors. specification:Item Type: Smart Door Lock Material: Zinc alloy Color: Black Battery Type: Requires 4 AAA batteries (not included) Unlock Method: Bluetooth App, fingerprint, password, mechanical key Communication Mode: Bluetooth 4.1 Supported System: For Android4.3, for IOS 7.0 or above Unlock Time: 1.5s APP: For TTLOCK Application Range: Suitable for home, office, hotel, apartment door lock PackageList:1 x Front DoorKnob 1 x RearDoorKnob 1 x Locking Tab 1 xPinch Plate 1 x Pinch Box 2 x Key 1 xSquare Bar 2 xGrub Screw 2 xConnecting Pipe 2 xFront And Rear Plate Locking Screws 4 xSelf Tapping Screw 1 xBattery Cover Replacement Screw 1 xScrewdriver 1 x User Manual