Mega LD PAC (PAC-S1 / PAC-S10)
Pioneer Electronics (USA) and Sega Enterprises released this module that allows users to play 8-inch and 12-inch LaserActive Mega LD discs, in addition to standard Sega CD discs and Genesis cartridges, as well as CD+G discs. It was the most popular add-on bought by the greater part of the LaserActive owners, costing roughly US $600. It comes with a LaserActive-branded version of Sega's 6-button control pad (CPD-S1).
Source: Wikipedia, "[en.wikipedia.org/wiki/LaserActive%23PAC_modules LaserActive]", available under the CC-BY-SA License.