This is the Arrma ADS-5 waterproof V2 steering servo.
Includes: Arrma ADS-5M Servo with Futaba style Connector 1.2 (32mm) diameter, 6-Point Horn 1.5 (39mm) diameter, 4-Point Horn 1.5 (39mm), Double Arm Horn 0.83 (21mm), Round Horn, four each Screws, Grommets and Eyelets
Torque: 70oz/in (5kg/cm) @ 6V
4.8V Speed: 0.14 sec
6V Speed: 0.12 sec
Dimensions: 1.6x1.5x0.79 (40x38x20mm)
Wire Length: 11.8 (300mm)
Spline: 25 tooth