This is the Futaba GY611 Gyro with the S9256 Digital Servo.

FEATURES: Super narrow pulse drive system substantially improves servo response
Microcomputer high-speed arithmetic processing substantially improves
gyro response
High-resolution 12-bit A/D (Analog to Digital) accurately converts
sensor output to a Digital Signal
SMM (Silicone Micro Machining) micro-machining mechanical parts and
systems right on a silicone chip and also low-back aeroform case
improves vibration resistance and neutral characteristic
AVCS (Angular Vector Control System) (same as Heading Hold) system
requires a high-precision angular velocity detection function and
extremely small output drift by using a new type of gyro sensor.
This minimizes rudder neutral position drift during flight and
eliminates the need to trim the rudder during flight.
Futaba S9256 (FUTM0226) Digital Servo is fully compatible with
super narrow pulse drive and features high response (.06 sec/60)
and Alumite case with heat sink to cool the motor

INCLUDES: Futaba GY611 sensor, control amp, S9256 servo, mini screwdriver,
3 sections double sided tape and instruction sheet

REQUIRES: 4.8V Rx battery ONLY (higher voltage could damage the servo)
Assembly and adjustment onto the helicopter

SPECS: GY611 Ratings;
Yaw-axis stabilizer for helicopter (rate gyro)
Display Device: 8-character dot matrix Liquid Crystal Display
Operating Voltage Range: DC 3.8V to 5V
Current Drain: 70mA @ 5V, including sensor
Dimensions: Amp 2.2"x 1.2"x .59" (57 x 32 x 15mm)
Sensor 1.2"x 1.2"x .71" (30 x 30 x 18mm)
Weight: Amp 1.19oz (34g)
Sensor 1.05oz (30g)

S9256 Servo Ratings (FUTM0226);
Dimensions: 1.6"x .79"x 1.4" (40 x 20 x 36.6mm)
Weight: 2.01oz (57g)
Speed: .06 sec/60 (at 4.8V)
Torque: 47 oz-in (3.4 kg-cm) (at 4.8V)