1: The service life of the fingerprint lock is 8-15 years. If the product you receive has quality problems and cannot be used, you can directly apply for a refund without sending the product back to China. (Please rest assured to buy)
2: You will receive a paper fingerprint lock installation guide, please strictly follow the product installation guide to install.
3:What should I do if the fingerprint lock suddenly breaks? do not worry! The paper installation guide you received will explain how to unlock the fingerprint lock if it is damaged.(Note: This method can only be used in emergency situations!)
4: This fingerprint lock can set up to 20 fingerprints, please set your fingerprints according to this link video.
5: If you have any questions, please contact the seller directly.
6: Please pay attention to the information sent to you by the seller
The original lock cylinder size is: indoor length from 20MM to 60MM, outdoor length from 20MM to 75MM, this product can be replaced. 
Adjustable lock cylinder Suitable for doors with a thickness of 40MM-135MM. 
Product Detail 
It has passed 50,000 fingerprint recognition tests by the National Laboratory of China, and the fingerprint recognition efficiency is as high as 99%.(Press your fingerprint 100 times to unlock more than 99 times, the unlocking efficiency is as high as 99%)
The service life of the fingerprint lock can reach 8-15years.
Super energy saving
Can hold up to 6 batteries
6 batteries can be used for 12 months.
1
Low battery alarm: If the battery power is less than 5%, the fingerprint lock will flash red to remind you to change the battery.
2 Micro-USB charging
USB emergency power supply can be used
2: You will receive a paper fingerprint lock installation guide, please strictly follow the product installation guide to install.
3:What should I do if the fingerprint lock suddenly breaks? do not worry! The paper installation guide you received will explain how to unlock the fingerprint lock if it is damaged.(Note: This method can only be used in emergency situations!)
4: This fingerprint lock can set up to 20 fingerprints, please set your fingerprints according to this link video.
5: If you have any questions, please contact the seller directly.
6: Please pay attention to the information sent to you by the seller
The original lock cylinder size is: indoor length from 20MM to 60MM, outdoor length from 20MM to 75MM, this product can be replaced. Adjustable lock cylinder Suitable for doors with a thickness of 40MM-135MM. Product Detail It has passed 50,000 fingerprint recognition tests by the National Laboratory of China, and the fingerprint recognition efficiency is as high as 99%.(Press your fingerprint 100 times to unlock more than 99 times, the unlocking efficiency is as high as 99%)The service life of the fingerprint lock can reach 8-15years.
Super energy saving Can hold up to 6 batteries
6 batteries can be used for 12 months.
1
Low battery alarm: If the battery power is less than 5%, the fingerprint lock will flash red to remind you to change the battery.
2 Micro-USB chargingUSB emergency power supply can be used
