Futaba S9352HV Hi Voltage Hi Torque/Speed Servo FEATURES: Designed to be used with models requiring especially high torque and high speed Must be used with 2.4GHz radio systems for full performance INCLUDES: Futaba S9352HV Servo with 1.7 (42.3mm) 3-Point Horn, 3x8mm Horn Screw, four Eyelets, two Rubber Grommets and Instruction Sheet REQUIRES: Power supply of 6.0 - 7.4V