Simplex is the type of push button lock.
Vline, I'm pretty sure, are all made in USA.
Don't think a toddler would get in, if you get combo wrong you have to turn knob counterclockwise to reset. You can't just keep pushing buttons until it opens. Can also set up to require single and/or simultaneous double button pushes.
I was set on electronic, but got Simplex. I think electronic has more to go wrong and Simplex is really fast, easy to do in the dark etc.
I think Fas1 (Fast1?) is going out of business (health issues for owner)? I have a couple Vlines that I love, and would get a Fas1 if I needed a new one (if they are still available.....)