PWM
Servo
https://learn.adafruit.com/adafruit-arduino-lesson-14-servo-motors/overview
1 €
TOWERPRO SG-90 Micro Servo
All Nylon Gear
Connector Wire Length 150MM
Dimensions: 22.2*11.8*32.2mm
Operating Speed (4.8V no load): 0.12sec/60 degrees
Stall Torque : 1.2kg / 42.3oz(4.8V);1.6 kg / 56.4oz (6.0V)
Temperature Range: -30 to +60 Degree C
Dead Band Width: 7usec
Operating Voltage:3.0-7.2 Volts
Net weight: 14g
Color: blue