Zimo MX634 wires only Decoder (replacment for the MX631R)DCC + RilCom, DC-anakig, MM, AC-analogSize 20.5 x 15.5 x 3.5mm1.2A motor, total (peak2.5A)6 Functions outputs (2 of them- FA3, FA4- switchable to logic level)2 Logic level outputs for more functions, servo control line or SUSI direct connection for external energy storage.