The FES 3 Axis gyro is very easy to setup and eliminates the need for a tail gyro.

The GU-365 3 Axis GYRO is not suitable for Nitro Heli's due to the increased vibrations.

GU-365 3 Axis GYRO Specifications :
-Control system : AHDCS (Active Helicopter Digital Control System)
-Content : 3-Axis gyro
-Operating voltage : 4 ~ 6V DC
-Dimensions : 44.5 x 31 x 14mm
-Weight: 18g