It is often necessary for troubleshooting purposes to know which attendant version you have. The easiest way to know is to check the hostname, which should be printed on a sticker on the attendant:
- ATD3471 and below: v3
- ATD3472-3500: v4
- ATD3501-3999: v3
- ATD4000 and above: v4
If the sticker is missing or illegible, you can also tell by inspecting the device. v4 attendants have a red reset button and a small screen, both of which are absent on v3 attendants.