Adjustable Lock Cylinder: the inside handle can be adjustable freely extended by 10 to 20mm. Fingerprint Unlock: Max support with 100 fingerprints. suitable for both safety doors, doors, wooden doors, glass doors. Support 100,000 times of rotating reliable test to make sure high stable and safe quality. Long Life Battery Caring: One charge can be used: 8-12 months, Charging takes only 2 hours Specifications: An easy to install, maintain and use smart door lock that requires no drilling, no wiring and no carpentry work. Unlock conveniently via your Tuya APP, fingerprint. Security Level: Highest Level Number of Fingerprints: 21, 1 administrator fingerprint, 20 ordinary user fingerprints Suitable Door Types: Security door, door, wooden door, glass door Adapt to Door Thickness: 60-100mm Lock Cylinder Size: 70mm 90mm APP: Tuya Unlock Mode: Fingerprint, Bluetooth APP Material: 304 stainless steel + aluminum + plastic colour: black Package Contents: 1 x Fingerprint lock 2 x Screw 1 x English manual 1 x Data cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.