This is the Futaba SBD-1 (200mm or 400mm) S.Bus Decoder.

FEATURES

SBD Link software determines which channel each servo responds to-
preventing mismatched servo-channel connections
Three servo outputs that can be programmed to specific channels
Compatible with standard analog and digital servos as well as
programmable S.Bus servos
One year limited warranty through manufacturer beginning at date of
purchase

INCLUDES

Futaba SBD-1  S.Bus Decoder with Instruction Sheet

REQUIREMENTS

Connecting to servo connection port of the SBC-1 Channel Setting Tool
and following instructions