The N64 Memory Expansion Pak, a 4MB RAM expansion for the Nintendo 64 video game console.  It added to capabilities of the system and was used for a few games and was required for the 64DD add-on.
<a href="//commons.wikimedia.org/wiki/User:Evan-Amos" title="User:Evan-Amos">Evan-Amos</a>
<span class="int-own-work" lang="en">Own work</span>