Can I arm system on the keypad without a code?

@mnichting​ That's correct, but why would they?  The main thing is that the alarm can't be disarmed without the code or the app.

Ok thanks for all of this!  The key pad is in the lobby of business so it seems weird to me that one wouldn't need a code, but no problem.  As long as I know the rules.  Thanks again!

For a number of reasons (none of which are because it can be armed w/o a passcode) I would make sure that the keypad is somewhere that customers cannot physically access. Aside from general tinkering they can literally just slide it up and off the wall and walk off with it. While it's not likely that would happen it seems better safe than sorry.