The Futaba S-CD400 is a low-profile digital servo purpose-built for 1/10 scale RC drift cars, supporting both UR mode and SR mode for full compatibility with S.BUS-equipped Futaba transmitters. It uses a coreless motor with metal 2-4 stage gears and an aluminium final-stage gear inside a lightweight resin case, delivering 8.0 kgfcm of torque and 0.08 sec/60 speed at 7.4V.