This is the Futaba High Voltage BLS251SB S.Bus2 Helicopter Rudder High-Speed Servo.
FEATURES: Brushless motor 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* Programmable and compatible with S.Bus and S.Bus2 Aluminum center case section helps to dissipate heat One year limited warranty through Hobby Services beginning at date of purchase
INCLUDES: HV BLS251SB S.Bus2 Servo with Instructions and Mounting Hardware 1.8" (45mm) diameter Round Horn 1.52" (38.7mm) four point Horn 1.2" (31.5mm) six point Horn
SPECS: Torque: 52.78 oz-in (3.8 kg-cm) @ 4.8V Speed: 0.06 sec/60° @ 4.8V Dimensions: 1.57 x 0.79 x 1.45" (40 x 20 x 36.8mm) Weight: 2.12 oz (60 g) Power Supply: 4.8V Neutral Pulse Width: 760us
COMMENTS: *Do not connect this servo directly to a receiver or damage will result. This servo is compatible only with the gyros listed above. Do not use with 1520us pulse width.