This post seems to be older than 1 year— so keep that in mind while reading. It might be outdated.
Some basic information on the new scanners from a rural carrier who just started using it on their route.
The pen attached does not work.. You still have to have the customer sign the 3849.
When you deliver something you have to indicate where you left it (in mailbox, at front door, in parcel locker, with individual, with neighbor).
The screen is a touch screen, you can use the buttons, or tap on screen like a smart phone.
They download every 10 seconds, but the list of scans remain in the scanner and the number of scans can be verified at the end of the day.
You can verify how you scanned something, but you cannot change it after the 10 seconds/download.
They are not light sensitive. They scan immediately in direct sunlight.