Overview: Tarot GY550 adopts Fuzzy PID AVCS technology. The features it has like quick starting, sensitive response & small size ect. It can keep the servo uniform speed during the hard 3D flying. It is specially designed for helicopter & with Metal crust to screen electromagnetic interference. It is best to match with digital servo that will get perfect performance. Independent adjusting for tail locking & speed control, cancel the movable elements on the common Gyro. All the setting via transmitter. Color light shows the working status clearly.AVCS system, automatically eliminate excursion which is occurred by the wind or other factors. Dual mode, Switch as Normal or Tail locking via transmitter. Stability adjustment, Adjusting gyro's control stabilization via transmitter to suit different helicopters. Specification: Servo type: Analog (1520u S/70 Hz), Digital (1520u S/280 Hz), Narrowband (760u S/560 Hz)DIR: Normal / Reverse Speed: Available scale 1~10 Delay: Available scale 1~10 Limit Left: Available scale 50%~150% Limit Right: Available scale 50%~150% Reset: Reset to the factory settings Working voltage: DC 4.0 ~ 6.0V Working current: 5m A @ 5.0V Temperature:-5℃ ~ 45℃ Weight Approx:63g Size Approx:12 x 6 x 4