When you scan a package on the Leo, a small gray bubble with text will show in the bottom of the screen (it goes away quickly), and it will say Adult, Direct, or Indirect Signature Required.
I'm still pushing hard for them to code in a special sound for the different SRs. That toast popup (that's what it's officially called in the android world) is insufficient when you are scanning a bunch of pkgs. I don't know what braindead Memphis maroon thought that a courier scans, looks, scans, looks, scans looks.
Yes, the old powerpad was kinda annoying and slowed you down when all your packages were SR (it would beep, display a message, and you had to wait until that message was gone before you could scan again) but it made it VERY clear that it was something special.
The post offices zebra warns them of an aggressive dog when they get within a certain radius of an address. The actual phrasing escapes me but it actually says "dog attack report, something something" and it beeps 18 different ways from Saturday depending on the scan presented. There is NOTHING other than pure laziness that stops us from doing something with our scans.