Object is a plug-in circuit board with several ICs and three round batteries. It has two, 18-pin connectors labeled AA1 to AV1, BA1 to BV1 on the front side, compatible with DEC "flip-chip" modules. It has a single white plastic extraction handle. It has translucent plastic protective covers glued to each side. The front cover has a cut-out exposing jumpers for "normal" and "leap" years. The batteries are soldered to the board and are corroding.