This is the Futaba High Voltage BLS251SB SBus2 Helicopter Rudder High-Speed Servo. Featuring a brushless motor it offers incredible holding power and 5X longer life than servos equipped with brushed motors. Compatible with the Futaba CGY750, GY701, GY520, GY430, GY611 and GY601 gyros. It is fully programmable and compatible with SBus and SBus2. The aluminium centre case section increases strength/rigidity and helps to dissipate heat.
Note: Do not use this servo directly plugged into a receiver or without one of the listed gyros. It is not compatible with 1520us pulse width operation.