Product dimension showed 9.2 x 5.2 x 1.9 inches, hard to believe this is correct. Can anybody please tell me the exterior dimension?

The exterior dimension is 4-3/4 in. (12 cm) H x 3-1/4 in. (8.3 cm) W x 1-1/2 in. (3.8 cm) D

can you mount this on a door?

You can mount it on a door if you can do so securely. I would not recommend mounting it on a hollow core door. A metal door maybe. It would be best to mount it on the door facing. It works out well there for me.

How do you get this out of plastic package? Yes, I am serious.

Just cut around the circle as marked in the back. You'll be able to see the place where the two plastic zip ties meet. You can cut through these with a sharp blade. Once that's cut you'll be able to remove the Master Lock from the plastic packaging. Good luck!

Can numbers be used more than once in a combinatio? For example, could my combination be 3531?

Amazon has this question incorrectly shared with model 5401D combination lock. On the PUSH button lock you cannot use the same number twice. On the combination lock you can choose from 0 to 9 on each of the dials so 3531 would work fine. I have one of these and am buying a second one for a garage lockbox. I like this version over the push button exactly because of the flexibility of the combination.

5401D Select Access Wall-Mounted Key Storage Box with Set-Your-Own Combination Lock

Product ID: 114872130

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Details

Brand
Master Lock
Special Feature
Durable
Lock Type
Key
Item dimensions L x W x H
38 x 83 x 121
Material
Metal

🔒4-digit resettable combo lock

🧰spacious internal cavity

🛠️durable metal wall-mount design

Description

🔐 Secure your keys, unlock your peace of mind.

BUILT TO LAST - Rugged metal construction designed for both indoor and outdoor wall mounting.
SLEEK DISCREET - Polished black finish blends seamlessly into professional or home environments.
SPACIOUS SECURITY - Generous internal space to securely store multiple keys or access cards without clutter.
KEYLESS CONVENIENCE - Set and reset your own 4-digit combo for ultimate control and zero key hassle.
PERSONALIZED PROTECTION - Thousands of unique combination options ensure your access stays exclusive.

The Master Lock 5401D is a compact, wall-mountable key storage box featuring a resettable 4-digit combination lock, durable metal construction, and a spacious interior designed for secure indoor or outdoor use. Perfect for professionals seeking reliable, keyless access control with customizable security.

Specifications

Brand	Master Lock
Special Feature	Durable
Lock Type	Key
Item dimensions L x W x H	38 x 83 x 121 Millimeters
Material	Metal
Recommended Uses For Product	Home
Style	Standard Dial
Colour	Black
Number of Pieces	1
Finish Type	Polished
Included Components	Lock Box
Controller Type	Combination control
Shape	Rectangular
Item Weight	494 Grams
Control Method	App
UPC	636123861282 071649376702 642125235310 804993522866 640026239284 689530457357 100012605719 071649215421 641438450144 762319853561 745332605553 094718114074 071649214523 638084727638 716080048381 640206480239
Model Name	5401EC
Manufacturer	Master Lock
Department	Lockboxes
Country of Origin	USA
Item model number	5401EC
Product Dimensions	3.81 x 8.26 x 12.07 cm; 494 g
ASIN	B0002YP1UI

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