Smart Fingerprint Password lock for door

4-IN-1 SMART LOCK DESCRIPTION: This fingerprint door knob have 4 ways of keyless entry: fingerprint + Bluetooth APP + Password + Backup Mechanic Keys. 2021 New upgraded fingerprint technology, less than 0.3 second identification,125 fingerprints & 150 password capacity. No more fumbling around for keys when you go out. SMART AND MODERN FEATURES: The fingerprint door knob is made of sturdy and durable zinc alloy, which is safe and firm. The appearance design is so modern and fashionable, which is very suitable for bedroom, Airbnb, office. It requires 4* AAA batteries and can be used for up to 10-12 months. USB emergency charging. No need to wire, no need to drill, you can easily replace the keyless door and window into the existing knob. Compatible with indoor doors (applicable to left and right doors) the thickness of the door is 35mm-55mm. Door hole diameter: 50-60mm. External power supply interface in case of dead battery. Low batteries alarm- When the battery power is less th