Handgun Safe Question

A couple of years or so ago, I examined a handgun-size safe at a gun store that I visit infrequently (due to its distance from my home), which was unlocked by a combination lock having three or four "mechanical" (not dependent on batteries) buttons you pushed (not a dial to be turned) to open. I'm interested in this lock configuration because I recently discovered that the 9-volt batteries in both safes I keep cabled inside of my two vehicles died after less than a year of storage. Too, most safes relying on batteries to open them have the batteries mounted in areas very difficult to access when replacing them.
Anybody know where I can get a couple of them? Thanks.

Thanks FAS1! The one that I handled was configured horizontally but the one you referenced I think might be even a better choice. You found it and I'm grateful.

Thanks, also, to rabid wombat and cslinger.

Can I assume that it's possible to adjust the Simplex combination lock to accommodate your own personal number?

Thanks, rabid wombat.