It is a device to manage your company's truck driver's milage and fuel usage.
http://www.petrovend.com/Literature/K800.pdf
http://www.webq.opwfms.net/manuals/ChipKey/M72-01.04%20ChipKey%20Encoder%20Owners%20Manual.pdf
http://www.webq.opwfms.net/manuals/System2/M41-41.04B%20System2%20for%20Mileage%20Reasonability%20ChipKeys.pdf
[quote="one of the above PDF's"]
What are M.R. ChipKeys?
Mileage Reasonability (MR) ChipKeys, sometimes called “Read/Write
ChipKeys, differ from standard read-only keys in that they allow data to be written to them.
You can program your SYSTEM2 to modify values stored in the Chip-
Key (such as validation status) each time customers insert their ChipKeys
into a SYSTEM2 C/OPT or FIT (Fuel Island Terminal).
Note: Although there is an Odometer Reasonability selection in the
System2 Restrictions menu (Page 67), that option is mainly for
cards, not ChipKeys.
MR ChipKeys let an operator enter odometer readings along with other
information at the FIT. The odometer entries are saved (written) only to
Vehicle ChipKeys -- Driver ChipKeys are read-only. All entries, up to the
“Maximum Transaction Numberâ€