This is a Heavy Duty Futaba J-Series 400mm Servo Extension.

This extension goes between the receiver and the servo to make the wire longer.
                 On one end of the wire is a male connector
           and on the other end of the wire is a female connector.

FEATURES: Connectors slide snugly together to guard against vibrating loose.
          Gold-plated terminals improve conductivity and prevent oxidation for
            longer lifespan.
          Heavier, 20-gauge wire handles higher current loads with ease.

INCLUDES: One Heavy Duty Futaba J-Series 400mm Servo Extension

SPECS:    Wire Gauge: 20
          Length: 15-3/4" (400mm) (between terminal ends)
          Wire Color Codes-
            Black: negative
            Red:   positive
            White: signal (polarity tab is on the signal side)
                                                                    JXS 5/30/01
                                                                          ir/jl