Fingerprint Door Lock,Bluetooth Door Knob Lock,Smart Lock,Key-less Entry Door Lock for Home Apartment Office Description:     The smart lock can read fingerprints in 360 degrees to unlock within 0.25s. And supports 4 ways to unlock,fingerprint,Bluetooth app, password and mechanical keys.Applicable for both left and right-handed doors Features: One Touch Unlock:The smart lock can read fingerprints in 360 degrees to unlock within 0.25s. And supports 4 ways to unlock,fingerprint,Bluetooth app, password and mechanical keys Material:Streamlined ergonomics design,Integrated zinc alloy handle,304 steel lock body real material,rustproof and is more durable 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 Business Management System:E-keys management,fingerprint unlock management, pin code management,users management,check unlock record,20 language options,realize smart lock Specifications: Material: Zinc Alloy Color: Black Unlock Mode: fingerprint + mechanical key+password +Bluetooth app 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