What's the maximum thickness of door this can work with? Mine's over 2 inches thick.

That should be fine. It will work.

Lost the programming instructions. Where can I get another copy?

Instructions can be found on their website or YouTube. Just as easy as asking your question.

Is there any kind of power backup like some have, or once the batteries are dead, that's it?

once the batterys are dead thats it you need to use your key and put in new batterys

Is the key supposed to be included?

Yes. But it’s not much of a key. Just a piece of metal. Don’t expect to use the key frequently

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Description

Touchscreen Keypad with blue backlight: Touchscreen Keypad has good performance that it avoids the problems caused by unstuck physical buttons; The blue backlight enable you to enter passwords more convenient even in darkness.
Mechanical key: No need to call firemen and no long need to remove the handle to use the key. Handle improved--keyhole exposed. Insert the mechanical key. Turn the key clockwise and the electronic door lock opens.
Anti-peep password: Users can create any random digits in front of or behind the correct password (random digits +correct digits+ random digits) so that you do not have to worry about being watched nearby when you input the password.
Interchangeable door handle and Fashion appearance: Comes with the changeable door handle that the door lock can be used on left and right; The door lock is apply to be used in all kinds of the doors with upscale appearance.
Easy installation: Come with a hexagon screwdriver. Just follow the user guide to finish the assembling even you are not a professional. The suitable door thickness for the door lock is 1.38 inch -1.97 inch. Note: The package does not include the batteries.

Description: Opening modes: -. Password -. Mechanical key (You can open the door using password or emergency key) Features: -. Touchable password keypad -. Hidden mechanical keys -. Blue keyboard backlight -. Can be unlocked quietly -. Password privacy protection -. Motor-driven clutch -. Interchangeable door handle on left and right -. American standard three-lock body Note: Emergency key use: remove the keypad handle with a wrench. Insert the mechanical key. Turn the key clockwise until the door lock opens. (The key is for emergency use and the high torque is normal when it opens. Specifications: Power supply: DC6V, 4 AAA alkaline batteries (Not included) Quiescent current: ≤ 30uA Working current: ≤ 250mA Installation specifications: Door thickness 1.38 to 1.97inch, 35 to 50mm Door edge to circle center distance: 2.36 to 2.76inch, 60 or 70mm (adjustable) Front plate size (L x W x H):5.12 x 3.07 x 1.18inch, 130 x 78 x 30mm Rear plate size (L x W x H): 5.12 x 3.07 x 0.98inch, 130 x 78 x 25mm Handle size (L x W x H): 5.20 x 1.18 x 1.89inch, 132 x 30 x 48mm Package includes: 1 x Main Unit 2 x Mechanical Keys 1 x Hexagon Screwdriver 1 x User Guide

Manufacturer	Signstek
Part number	ST668
Item Weight	454 g
Product Dimensions	8 x 7.9 x 13 cm; 453.59 g
Batteries	4 AAA batteries required.
Item model number	ST668
Color	Matte Black
Style	Modern
Finish	Polished
Material	Zinc
Shape	Rectangular
Item Package Quantity	1
Number Of Pieces	1
Special Features	Touchscreen Key
Included components	Key, Screws
Batteries Included?	No
Batteries Required?	Yes
Battery Cell Type	Alkaline

Signstek Keyless Entry Smart Door Lock, Digital Smartcode Electric Lock for Front Door, Keypad with Handle and Security Key, Touchscreen, Easy Installation, Matte Black

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