The Avionic SAG head lock MEMS heli gyro features high sensitivity and minimal reaction time, fully utilizing the potential of modern high speed digital rudder servos like Futaba S9257 servos. When you turned on DS mode (Dual sense adjustment function), it is more sensitive to adjust gyro degree from 0.5 degree/s to 800 degree/s smoothly and precisely response within 2 second. When raising or descending your helicopter rapidly, the tail of helicopter have no swing.
This is specially best for  aerobatic 3D flying, it will be more steady and easily to control. Install the Avionic SAG and get the best performance in your 3D flying be it from a 250 to 450 to a 500 sized heli.

FEATURES
• Dual sense adjustment - You can adjust sense on transmitter or gyro.
 • Precise/Linear range - Wide gyro rate range from 0.5degree/s to 800degree/s, offer faster, smoother response and consistent pirouette rates; Steady head-lock while hovering, which prevents tail from deviating anytime.. all the time.
 • Stable control - Easy to get stable sensitivity, when you rotate helicopter fast, you can stop it immediately without any wag!  
 • Fast response - Offering superior 2ms response time on DS mode. When you change the helicopter between pitch pumps rapidly, you almost can not see any tail deviation/s.
the Avionic SAG is rated as a Integrated MEMS sensor type (AVCS rate gyro) - Angular Vector Control System
• Control system: Digital advanced PI (Proportional Integration) control
• Gyro sensor: SMM (Silicon Micro Machine) system vibration gyro
• Operating voltage:  +4 to +6V DC
• Operating temperature range:  -10°C to +45°C
• Weight: 9.7g (including connector)
• Functions: Gyro operation direction switch, DS mode switch, Control sense trimmer, Limit trimmer, Remote gain control, AVCS normal mode switching.