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

🔐 Unlock the Future of Home Security!

EMERGENCY READY - Mechanical key access ensures you're never locked out.
EFFORTLESS SETUP - Install in minutes, no professional help needed!
SEAMLESS SECURITY - Experience the future of home security with a sleek touchscreen keypad.
DISCREET PROTECTION - Input your code with confidence, thanks to the anti-peep feature.
STYLISH VERSATILITY - Interchangeable handles for a custom look that fits any door.

The Signstek Keyless Entry Door Lock combines modern technology with stylish design. Featuring a touchscreen keypad with blue backlight, anti-peep password protection, and an interchangeable handle, this smart lock is perfect for any door. Easy to install and user-friendly, it ensures both security and convenience for your home.

Specifications

Brand	Signstek
Special Feature	Keyless Entry, Keyhole for emergency,Anti-peep password,Touchscreen,Interchangeable door handle and Fashion appearance,Easy Installation
Lock Type	Keypad
Item dimensions L x W x H	3.15 x 3.11 x 5.12 inches
Material	Zinc
Recommended Uses For Product	Front Door, Back Door, Side Door, Bedroom Door or Garage Door, Laundry Door, Airbnb short-term rental room, apartment
Style	ST668
Color	Matte Black
Number of Pieces	1
Finish Type	Matte Black
Included Components	Door Lever, Latch, Strike, Mounting Plate, Screws,Installation Instruction
Controller Type	Keypads
Shape	Rectangular
Item Weight	1 Pounds
Control Method	Touch
Model Name	ST668
Manufacturer	Signstek
Part Number	ST668
Item Weight	1 pounds
Product Dimensions	3.15 x 3.11 x 5.12 inches
Item model number	ST668
Batteries	4 AAA batteries required.
Is Discontinued By Manufacturer	No
Finish	Matte Black
Item Package Quantity	1
Special Features	Keyless Entry, Keyhole for emergency,Anti-peep password,Touchscreen,Interchangeable door handle and Fashion appearance,Easy Installation
Batteries Included?	No
Batteries Required?	Yes
Battery Cell Type	Alkaline

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