This is the Heavy Duty 4" Servo Extension with Futaba J Connector from Electronic Model Systems. FEATURES: Installs between the receiver and the servo to make the wire longer One end of the wire has a male "J" connector and the other end of the wire has a female "J" connector INCLUDES: One 4" (101mm) Heavy Duty Dual Servo Extension w/ J Connectors SPECS: Wire Color Codes- Black: negative Red: positive White: signal (polarity tab is on the signal side) cnh 9/30/08 ir/jxs