This is the Ace RC DS1903 Waterproof Digital Servo.

FEATURES: Ideal for 1/8 and 1/10 scale RC vehicles

INCLUDES: Servo with 1.5" (39mm) 4 Point Horn, 1.6" (41mm) Double Arm Horn
            Horn Screw, four each, Mounting Screws, Grommets and Eyelets

SPECS:    Torque: 41.7 oz-in (7.8 kg-cm)
          Speed: 0.19 sec/60°
          Dimensions: 1.6 x 0.79 x 1.4" (40.9 x 20mm x 36.1mm)
          Weight: 47g (0.047kg)

                                                                   jxs 08/14/12
                                                                         ir/jxs