For sale used Futaba GY611 Gyro + S9256 Servo for R/C Helicopter Tail Rotor NOTE: The rated voltage for the S9256 servo is 4.8VDC, the control unit is rated for 6.0VDC. If you're using a 2S LiPo you'll need a voltage regulator to step the voltage down to the rated maximum(s). To maintain 6.0VDC to your cyclic servos and receiver use a Futaba PS-01 voltage regulator between the GY611 control unit and servo. Futaba voltage regulator: Futaba PS-01 Voltage Regulator 5.0VDC Servo Voltage Stepdown Regulator | eBay The gyro was powered up and it appears to work normally. However, this was on the bench and not actually test flown in a helicopter. The receiver and voltage step down shown in the photo is not included. Reprinted hard copy manual included. Let me know if you have any questions. Thanks for looking!