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Michael, Librarian
Category: Consumer Electronics
Satisfied Customers: 3229
Experience:  20+ years as information professional
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I am having trouble opening my modrl A3750 safe since I only

Customer Question

I am having trouble opening my modrl A3750 safe since I only remember the first 3 numbers. How many numbers are in the code so i can try possible additional numbers to complete can opening sequence??? ALSO can I use long lasting lithim batteries to replace present batteries???
Submitted: 1 year ago.
Category: Consumer Electronics
Expert:  Michael replied 1 year ago.

Your particular safe will have either a 3 or 4 digit combination. I have included here the manual for your safe so that you can review and try what is recommended to open the safe:

If after trying all possible combinations and still no luck in opening the safe, then my recommendation would be to contact Sentry directly as they can then send you your combination as the batteries should be fine for what you are using. Contact info for Sentry can be found here: