Motorola MDT-9100 – Mobile Data Terminal

The MDT-9100 was a mobile data terminal, developed by Motorola (USA) during the 1980s, as one of the successors to the D-1118. The units were developed for use by the Police and were mainly built into police vehicles. Several versions of the 9100 were introduced over the years.

Source: http://www.cryptomuseum.com/crypto/motorola/mdt9100/index.htm