Specification : 1) Brand : CHINA OEM (Compatible) 2) Pinout : Orange/White = Signal , Red = VCC , Brown/Black = Ground. 3) Gear Material : A) MG995 / MG996r / MG90s = Metal Gear B) SG90 / S3003 = Plastic Gear 4) Servo Size : A) MG995 / MG996r / S3003 = Standard Size Servo B) SG90 / MG90s = Micro Servo 5) Servo Control Degree : A) 0-180 Deg (Can control with Arduino) B) 0-360 (Continuous Rotation) 6) Servo Tutorial LInk : URL : https://www.arduino.cc/en/Tutorial/LibraryExamples/Sweep Servo Tips / Notice : **MG995 / MG996R /S3003 need external power supply to power up. **If not enough ampere, will keep brownout and restart Arduino. **If using External Power Supply, remember common ground. Datasheet / Reference Link : MG995 : https://www.electronicoscaldas.com/datasheet/MG995_Tower-Pro.pdf MG996 : https://www.electronicoscaldas.com/datasheet/MG996R_Tower-Pro.pdf SG90 : https://www.electronicoscaldas.com/datasheet/SG90_Tower-Pro.pdf MG90 : https://www.electronicoscaldas.com/datasheet/MG90S_Tower-Pro.pdf S3003 : https://www.kjell.com/globalassets/mediaassets/701905_87902_datasheet_en.pdf?ref=B4794C7E13