1、One-touch Unlock:The smart lock can read fingerprints in 360 degrees to unlock within 0.25s. And supports 2 ways to unlock,fingerprint and mechanical keys 2、High Security and Privacy conservation:Anti-theft semiconductor fingerprint identification,AI intelligent learning chip,high speed and accurate fingerprint identification 3、High Quality Material:Streamlined ergonomics design,Integrated zinc alloy handle,304 stainless steel lock body real material,rustproof,solid and durable 4、Easy Installation:Easy to replace existing knobs with NO wiring.For door thicknesses from 1-3/8\u0027\u0027 to 2-1/8\u0027\u0027(35mm -55mm). Applicable for both left and right-handed doors 5、Emergency Backup:The hidden mechanical keyhole is safe and convenient to backup.When batteries power off, the door can be opened with a mechanical key,or fingerprint unlock after connecting USB for temporarily emergent charge Description:The smart lock can read fingerprints in 360 degrees to unlock within 0.25s. And supports 2 ways to unlock,fingerprint and mechanical keys.Applicable for both left and right-handed doors Description: One-touch Unlock:The smart lock can read fingerprints in 360 degrees to unlock within 0.25s. And supports 2 ways to unlock,fingerprint and mechanical keys High Security and Privacy conservation:Anti-theft semiconductor fingerprint identification,AI intelligent learning chip,high speed and accurate fingerprint identification High Quality Material:Streamlined ergonomics design,Integrated zinc alloy handle,304 stainless steel lock body real material,rustproof,solid and Easy Installation:Easy to replace existing knobs with NO wiring.For door thicknesses from 1-3/8'' to 2-1/8''(35mm -55mm). Applicable for both left and right-handed doors Emergency Backup:The hidden mechanical keyhole is safe and convenient to backup.When batteries power off, the door can be opened with a mechanical key,or fingerprint unlock after connecting USB for temporarily emergent charge Specification: Material: Zinc Alloy Color: Black Unlock Mode: fingerprint + mechanical key Applicable Door Thickness: 35-55 mm Fingerprint Acquisition Time: ≤0.25s Emergency Power Supply: USB Battery: 4*AAA Batteries Package List: 1*Smart Lock 2*Keys 4*AAA Battery 1*Bag of screw 1*User Manual 1*Smart Lock 2*Keys 4*AAA Battery 1*Bag of screw 1*User Manual