GMI-A11 Infinity Analogue Acolyte Expansion UnitINFINITY Acolyte is the perfect extension to the INFINITY Solo and Duo units. With each Acolyte unit added, another track output becomes available to you. This unit allows you to expand your Solo or Duo units allowing you up to 10 tracks controlled from a single handset. Its Model Railway Control [and beyond] OPTIONAL EXTRAS GMI A01 Infinity SOLO Model Railway Control Package GMI A02 Infinity DUO Model Railway Control Package GMI A21 Infinity REMOTE