This is a Heavy Duty Futaba J-Series 500mm 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. Heavy 20-gauge wire handles higher current loads with ease. INCLUDES: One Heavy Duty Futaba J-Series 500mm Servo Extension SPECS: Wire Gauge: 20 Length: 20-7/8" (530mm) (at ends of connectors) Wire Color Codes- Black: negative Red: positive White: signal (polarity tab is on the signal side) tjt 111102 ir/kh updated cmc 02/18/04