GDW BLS992 HV Brushless Digital Servo Description: 20Kg.cm/0.08sec/60°@6.0V 25Kg.cm/0.065sec/60°@7.4V 28Kg.cm/0.055sec/60°@8.4V 40*20*37.3mm Operating signal: 1520us / 333Hz Motor type: Brushless Usage: for RC 550-700 Class Helicopter