ST-668 Digital Electronic Touchscreen Keypad Security Entry Door Lock with Hidden Mechanical Key

$85.99 $99.99
Color: black

About ST 668

Anti-peep password keyless door lock

Users do not worry about being watched nearby when you open the electronic door lock and input the password. You can create any random digits in front of or behind the correct password (random digits +correct digits+ random digits)

View or download the user manual: ST668_Electronic_Touchscreen_Door_Lock_User_Manual.pdf

Hidden keyhole of security door locks for emergency

Remove the handle of touch keypad door lock with a wrench. Insert the mechanical key. Turn the key clockwise and the electronic code door lock opens. No need to call firemen to open.

Touchscreen Keypad with blue backlight

Using the touchscreen digital keypad can avoid the problems of physical buttons stutter because of good performance.

The blue backlight of front door locks more convenient when you enter passwords even in darkness.

Interchangeable door handle and Fashion appearance

Comes with the changeable door handle that the digital life touchscreen door lock can be used on left and right.

Moreover best digital security lock is used in all kinds of the doors with upscale appearance.

 Easy installation

Comes a hexagon screwdriver, just follow the user guide to finish the assembling of the digital key lock even you are not a professional.



✔The Easiest Installation - As long as the aperture of SIGNSTEK™ ST-668 is same as your current lock, installation is just a piece of cake. It comes a hexagon screw driver, follow the instructions and you will finish the assembling in 10 minutes even you are not a Lock Smith.

✔Customer Service - Free Shipping! We offer replacement, return or refund if you are not satisfied with our products.

✔Protects Like a Living Security in front of Your House - SIGNSTEK™ touchscreen keypad locker features a touchscreen keypad, emergency mechanical key, anti-peep password, interchangeable door handle, mute function, stay unlocked function and waterproof function.

✔Code Management - Administrator can modify & delete users. Perfect for landlord to manage tenants. Suitable for home, office, school, bank and so on.


FAQ of ST-668 Electronic Door Lock

Q: How do you lock it from the inside?

A: It auto locks after several seconds.

Q: Is this reversable for left or right doors?

A: Yes, it is.

Q: Does this have a key pad on both sides?

A: Just one way. Also don’t forget to keep fresh batteries in it and the spare key where you can still have accessed into whichever room you want. The door keypad works super great for our needs.

Q: What about if is it raining? the touchpad works wet?

A: It still works after raining.

Q: Does this door knob lock every time you shut the door are can you delate that part?

A: There is a code you can press to keep unlocked. You punch in the entry code then the # then * then #. That will unlock the unit. Then to relock when you leave, press * then # and that will lock it.


Product Information

Manufacturer Signstek
Item Weight 4.29 pounds
Package Includes


1*Signstek locker
2*Emergency Keys
4*AAA battery
1*User Guide

Package Dimensions 8.31 x 7.8 x 3.9 inches
Door thickness 1.38 inch -1.97inch
Handle size 5.2*1.18*1.89inch



  • 5-7 days domestic.

SIGNSTEK™ offers free shipping for the contiguous 48 U.S. states. Transit time is 5-7 business days. 

All SIGNSTEK™ products are stored in warehouses in Amazon warehouse or UPS warehouse in United States, and all our products use FBA or UPS shipping.

Note: We don't sell products in other country.

United States  Out of US.

Guaranteed Arrival

3-5 bussiness days or less 






In orders with more than one item, the processing time will be based on the item with the longest processing time. All orders can be shipped out within 24 hours on weekdays. Please note that the processing time is not included in the shipping time.

During public holidays, transportation time or processing time may be affected (up to 72 hours delay) because manufacturers and couriers will restrict their operations during this period. Although this is unfortunately out of our control, we will try our best to improve on this issue.

Order Successful
After you have successfully placed your order you will receive email confirmation from us. If you have any requests for your order, kindly let us know as soon as possible before your item enters the processing stage.

Contact us
If you have any urgent questions about the shipping, just feel free to contact us on our Facebook home page or send an email to us.

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