This is the Arrma ADS-5 Waterproof V2 Steering Servo.
FEATURES: Dustproof and waterproof in normal usage when mounted to a vehicle Ideal for use as a steering or throttle servo in 1/10 scale vehicles used for backyard bashing Dual ball bearings Heavy duty composite plastic gears
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
SPECS: Torque: 70 oz/in (5 kg/cm) @ 6V 4.8V 6V Speed: 0.14 sec 0.12 sec Dimensions: 1.6 x 1.5 x 0.79" (40 x 38 x 20mm) Wire Length: 11.8" (300mm) Signal: Analog Spline: 25 tooth