This is the Futaba GY401 Gyro with SMM Technology.  This is a High Performance, Compact and Light Weight, Angular Vector Control System (AVCS) gyro developed for model helicopters.  Because the sensor and control circuit are integrated, it is simple to install.

FEATURES:

• AVCS System: Since the rudder trim changes (caused by wind and other meteorological changes); the front, rear, and other heli attitudes change and are automatically canceled
• Tail (rudder) operation is easy, making it perfect for 3D flight. (also known as heading hold gyro)
• SMM Gyro Sensor: Use of this newly developed technology virtually eliminates rudder trim changes during flight (see COMMENTS).
• Digital Servo Compatible (DS Mode): DS mode makes it compatible with Futaba digital servos. This maximizes the high-speed response performance of the digital servo.
• Remote Gain Function and Mode Switching Function Remote: Gain function allows sensitivity switching from the transmitter and mode switching function allows AVCS/normal gyro mode switching.
• Integrated, compact and lightweight design made possible by high density mounting technology.
• Conductive Resin Case: This case improves EMC (Electrostatic and electromagnetic interference) resistance.

INCLUDES:
One GY401 gyro
One mini plastic adjustment screwdriver
Three mounting pads
One instruction sheet

SPECS:
Length: 27mm
Width:  27mm
Height: 20mm
Weight: 27g

COMMENTS: Can be used in helicopters and airplanes (Due to 0-100% Gain Adjust). The new SMM (Silicone Micro Machine) technology is the integration of mechanical elements, sensors, actuators and electronics all brought together on a common substrate chip. This hobby industry first, results in a gyro sensor with an unprecedented level of functionality, reliability, and sophistication.  This will not work with the JR digital servos. These have a different pulse.