The TowerPro SG90 micro servo can rotate approximately 180 degrees (90 in each direction), and works just like the standard kinds you're used to but smaller. You can use any servo code, hardware or library to control these servos. Good for beginners who want to make stuff move without building a motor controller with feedback & gear box, especially since it will fit in small places. Of course, it is not nearly as strong as a standard servo. Works great with the Motor Shield for Arduino or by just wiring up with the Servo library. Comes with a few horns and hardware.

To control with an Arduino, we suggest connecting the orange control wire to pin 9 or 10 and using the Servo library included with the Arduino IDE. Position "0" (1.5ms pulse) is middle, "90" (2ms pulse) is all the way to the right, "-90" (1ms pulse) is all the way to the left.

Description:
This Servo Motor works well for basic servo experimentation and can be used in applications where small size is a virtue and that don’t require a huge amount of torque.
Gears are nylon which is the case with most lower cost Servos.
Servo motors can be commanded to go to a specific position, such as for turning the front wheels on an RC model for steering or pivoting a sensor on a robotic vehicle.

Key Features of SG90:
Very small micro size
Can lift 3.75 lb positioned 1 cm from center of shaft
Servo can rotate approximately 180 degrees (90 degree in each direction)
Analog drive

Specifications:
Dimensions (L x W x H) = 0.91 x 0.48 x 1.14 inch (23.0 x 12.2 x 29 mm)
Weight = 0.32 ounces (9 grams)
Weight with wire and connecter = 0.37 ounce (10.6 grams)
Stall Torque at 4.8 volts = 22.2 oz/in (1.6 kg/cm)
Operating Voltage = 4.0 to 6.0 volts
Operating Speed at 4.8 volts (no load) = 0.12 sec/ 60 degrees
Connector Wire Length = 9.5 inches (24.13cm)
Universal "S" type connector fits most receivers
The wire colors are: Red = battery positive, Brown = battery negative, Orange = PWM signal

Package Includes:
1 SG90 Servo motor with attached 9.5" control cable
3 arms/horns for various interface applications
3 screws for mounting arms to the servo and mounting the servo