This is the Futaba S3071HV High Voltage, High Torque, Ball Bearing, Metal Gear Equipped, Standard Size S.BUS Servo. FEATURES: Designed for models that require very high speed and high torque May also be used in conventional (non-S.BUS) systems Ball bearing equipped output shaft One year limited warranty through Hobby Services beginning at date of purchase INCLUDES: Futaba S3071HV S.BUS Servo, 0.83" (21mm) Round Horn, 1.4" (35.8mm) diameter Round Horn, (39mm) 4-Point Horn, 1.2" (32mm) 6-Point Horn Mounting Hardware and Instructions SPECS: Speed: 0.19 sec/60° at 6.6V 0.17 sec/60° at 7.4V Torque: 138.9 oz/in (5.8 kg/cm) @ 6.6V 145.9 oz/in (6.5 kg/cm) @ 7.4V Size: 1.57 x 0.79 x 1.50" (40 x 20 x 38.1mm) Weight: 1.73oz (49g) Power Supply: 6.0 - 7.4V COMMENTS: For best performance, use with a 2.4GHz system. jxs 10/29/12 ir/jxs