Full description:
Instruction:

Intelligent drift canceling Circuit design, more precise operation angular speed inertia, more wide lock range, is suitable for low tail rotor rotational speed 6435rpm (T-REX 450X main rotor rotational speed 1300rpm) and up.
Dual Mode:Standard gain mode and head-lock mode.
Built-in drift cancel circuit.
Temperature compensation circuit.
Tail rudder direction switch.
Dual Gain Control on gyro and transmitter.
Apply for standard and digital servo
Compatible Futaba PCM/JR SPCM/Hitec QPCM receiver

Specifications:

Head lock Gyro:
Voltage:4.2~7V
Power consumption:Approx.33mA
Temperature range:DC+4~+6V
Temperature range:-5°C~+60°C
Dimension:23.5x21x15mm
Weight:12g