This is a 12" Long Pro Series Servo Extension with Futaba J Connector.
This extension goes between the receiver and the servo to make the wire longer.
One end of the wire has a male connector, the other has a female connector.
FEATURES: Pro Series heavy-duty radio accessories.
New, custom-designed connectors offer extra flight insurance with a
secure "click-lock" feature that guards against connectors
Gold-plated terminals improve conductivity and prevent oxidation for
Heavier, 20-gauge wire handles higher current loads with ease.
INCLUDES: One 20AWG, 12" Long Servo Extension w/ Futaba J Connector
SPECS: Wire Color Codes: Black=Negative, Red=Positive, White=Signal
The Polarity tab is on the Signal side.