This is the Hitec HS40 Economy Nano Servo.
FEATURES
Ideal for micro airplane, sailplane, and helicopters
Slightly larger than the Hitec HS-35HD servo
High impact nylon gears
Coreless motor
Long life potentiometer
INCLUDES
HS40 Servo with 0.67" (17mm) 4-point horn, 2.2" (55mm) Double Arm
Horn, 1.2" (31mm) Double Arm Horn, 1.1" (28mm) Double Arm Horn
extra Servo Horn Screw, Two 1.5x7mm Mounting Screws
SPECIFICATIONS
4.8V
Speed: 0.09 sec/60°
Output Torque: 0.6kg/cm (8.4oz/in)
Weight: 4.8g (0.17oz)
Size: 0.79 x 0.34 x 0.67" (20 x 8.6 x 17mm)