The SMD84 is an eight (8) output DCC accessory decoder (HO & N scale) specially suited to drive 3 wire solenoid type switch (turnout) machines. Size: 2.75" X 4.25" Works with most DCC systems that supports accessory decoders (see below).
HORNBY Digital R8214 DCC Controller Elite
Littfinski Ldt 080063 - Digital Booster DCC Z21 R8239 DCS100 5301 ZTC550 36520
Lenz Digital Plus Dcc Decoder L10132 LE1024
ESU 53614 LOKPILOT STANDARD DIGITAL DECODER21MTC DCC BOXED