This is the Hitec HSB-9380TH Brushless Digital Ultra Torque Servo.                                                                                         FEATURES: Ideal for large planes, 1/8-1/5 scale on and off road vehicles                  Titanium gears with dual ball bearings                                          High performance, brushless motor designed by Steve Neu                         Programmable features include, Fail Safe On/Off and Position,                   Direction, EPA, Speed (Slower), Dead Band, and Soft Start (downloadable software and DPC-10 PC Interface (HRCP4426) required)           Ultra hard gear shaft with three axial metal bushings                           Water and dust resistant                                                        Diamond cut aluminum center heatsink, red in color                              Metal/Plastic/duralumin hybrid first gear prevents electrical noise from affecting other components in the aircraft or vehicle                    PAD (Power Absorbing Device) prevents backflow of current when voltage regulators or receivers with voltage regulators are used              Two year limited warranty through Hitec beginning at date of purchase                                                                                 INCLUDES: 

            HSB-9380TH Servo with PAD (Power Absorbing Device), Instruction                   Sheet, extra 3x8mm Servo Horn Screw, Mounting Hardware,                         0.95" (23mm) Single Arm Horn                                                    1.2" (32mm) Single Arm Horn                                                     1.4" (36mm) diameter Round Horn                                                 1.5" (38mm) 4-Point Horn                                                        1.7" (44mm) Double Arm Horn                                                     2.8" (72mm) Double Arm Horn                                                     4.3" (110mm) Double Arm Horm                                                                                                                        SPECS:                       6.0V                                     7.4V                          Speed:             0.17 sec/60°                        0.14 sec/60°                   Torque:            472 oz-in (34.0 kg-cm)        472 oz-in (34.0 kg-cm)               
           Dimensions: 1.57 x 0.79 x 1.50" (40 x 20 x 38mm)                                Weight: 2.40oz (68g)  
                                                          Number of Teeth in Spline: 25