This is the Savox SB-2270SG "Monster Torque" Brushless, Steel Gear, High Voltage, Digital Servo.
Features:
*NOTE: Certain combinations of receiver and ESC have been found to cause "Brown Out" issues when combined with Savox servos. An external BEC, or BEC stabilizing receiver capacitor may be needed for efficient, glitch free operation in low voltage electric applications.
Specifications: