Hyperkin RetroN 5 3-in-1 Adapter for Game Gear, Master System, and Master System Card, Sega Gear: Sega Gear: Video Games - Amazon.ca
Hyperkin Retron 5 combines ten consoles into one on December 10 for $99 (updated) | Engadget
Hyperkin RetroN 3/ RetroN 2 Replacement System AC Power Supply Adapter (Bulk) | eBay
Hyperkin HY5418-001 Retron 5 User Manual
does the hyperkin adapter work(for retron 5)with Sg-1000, SG-1000 II , Sega Mark III (predecessors to the Master System but backwards compatible) : r/retrogaming
AC Adapter with Variable Heads Pockets for RetroN 5 - Hyperkin - Hyperkin Store