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[Easy to Install]No wire connection is needed.Within minutes you can swap out your basic lock for the fingerprint door knob. Press the fingerprint sensor and turn the handle to unlock.Applicable for both left and right-handed doors. Suits well for most standard U.S. front door locks. [Smart Handle Design Biometric Fingerprint Identification]The handle inside contains the fingerprint sensor, the chips, battery, and clutch components.Fingerprint capacity up to 30 fingerprints, integrated fingerprint handle, easy to open with a simple grip. [Two es of unlocking]Fingerprint Mechanical key,the smart fingerprint door lock use advanced biological fingerprint technology,only need 0.1s to unlock.The battery is dead when going out and you can use the emergency key to unlock.Multiple unlock options suitable for people of all ages. [Safety]Your fingerprint is unique in the world, which the safety without doubt.Taking technology of semiconductor and biological characteristics is adopted, which avoids the same fingerprint. To give you a better product experience, we recommend that you carefully read the parameters of the door lock before you order it. Unlock e: fingerprint mechanical key Applicable Door Thickness: 35-80 mm Fingerprint Capacity: 30 groups Fingerprint Acquisition Time: less than or equal to 0.5s Working Temperature: -20 Celsius-65 Celsius Emergency Power Supply: USB (Emergency USB port,only used to emergent connect and unlock,and can not directly charge internal batter) Battery:4 AAA Batteries(not included) Colour: black Material: zinc alloy Size: 145x65mm Package Contents: 1 * door lock 1 * front handle 1 * lock body 2 * mechanical keys 1 * installation kitOnly the above package content, other products are not included. Note: Light shooting 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.