Feature: 1. This lock supports APP to remotely control the on/off status of the lock and has a password sharing function, allowing you to control and know the safe use of the home lock anytime and anywhere. It has unlocking methods such as Bluetooth unlocking, password unlocking, mechanical key unlocking, and card unlocking. 2. With automatic sleep low power consumption mode, low battery prompt and USB emergency power supply interface power supply, so you don't need to worry about the lock power. 3. High‑frequency encryption card unlocking, not afraid of degaussing, safe encryption, compact and light, easy to carry. The card can support up to 100 users to share experience, and the password design adopts a virtual password design, which can effectively prevent others from peeping. 4. Remote control and gateway, compatible with for Amazon Alexa and for Google Home intelligent voice control system, to achieve voice unlocking, so that the lock can understand your instructions. (Only by cooperating with the gateway can the remote lock and voice control be realized. However, the delivery does not include the gateway, which needs to be purchased by the customer himself) 5. The design is made of aluminum alloy, and the lock cylinder is made of stainless steel, which makes the lock durable and still as new. The length of the nut with multiple fits meets the installation requirements of most door designs in various scenes, and the installation is stable and convenient. Specification: Condition: 100% Brand New Item Type: Smart Door Lock Material: Aluminum Alloy Color: Black TTLOCKAPP Bluetooth Password Card Lock, Four Ways to Open the Door Card Type: 2pcs M1S50 Card Support USB Emergency Power Supply. Password Capacity: Unlimited, Card Capacity: 100 Applicable Door Thickness: Approx. 35-55mm / 1.4-2.2in Working Temperature: -20℃-60℃ Dynamic Current: Less Than 20mA Quiescent Current: Less Than 10uA Error Rate: Less Than 0.001% Power Supply: 4pcs AA Alkaline Batteries, Single Standard Capacity: 1500mAh (shipped Without Batteries). Package List: 1 x Front Host of Lock Body1 x Back Host of Lock Body2 x Black Pad2 x Card1 x 5050 Lock Body1 x Steel Bar2 x Silver Connecting Tube2 x Connection Flat Screw2 x Key4 x Sharp Point Screw1 x Panel Snap Ring Note: Please note that the WIFI function needs to be used with the gateway.