This is the Futaba S9257 High Speed Digital Servo for Helicopter Gyro Operation. FEATURES: For use with the Futaba GY401 (FUTM0807, FUTM0808) and the GY502 gyros Equipped with two ball bearings One year limited warranty INCLUDES: Futaba S9257 High Speed Digital Servo with .83" (21mm) diameter round horn, 1.5" (39mm) diameter four-point horn, 1.2" (32mm) diameter six-point horn, mounting hardware, digital servo precaution sheet and warranty card REQUIRES: Connecting to gyro SPECS: Dimensions: 1.4 x 0.6 x 1.1" (36 x 15 x 29mm) Weight: .92oz (26g) Torque: 28 oz-in (2.0 kg-cm) at 4.8V Operating Speed: 0.08 sec/60° at 4.8V Lead Length: 7.9" (200mm) COMMENTS: For use only with FM, PCM and HRS systems. Do not use with AM systems jxs 8/07/07 ir/jxs